thisArg callbackcallbackthiscallbackthisundefined. Try it Syntax fill(value) fill(value, start) fill(value, start, end) Parameters value Value to fill the array with. UV map of a cube set up once and then draw to a canvas texture threejs example. start_index is an optional parameter, it specifies the starting index to fill the array, its default value is 0. The splice() method adds, removes and replaces elements in an array. I made an array of id's, names, etc; I need to fill the js data array but i can't do it. That right there is the power of slice()! The end parameter does not have to be specified. To fill an array in JavaScript, use the array.fill() method. This method is used to manipulate the existing array according to our needs. Parameters array T [] The Array to be filled. Syntax. We can concatenate an array with a sequence of values: Running the above code will log this to our consoles: We can concatenate an array with multiple arrays: When executed, the above code prints a list of numbers from 1 to 9: Now we will discuss a masterstroke method that can be used to add an element anywhere in an array - start, end, middle, and anywhere else in-between. Examples: new Array(1000).fill(0).map( (_, i) => i + 1); [.new Array(1000)].map( (_, i) => i + 1); Also one more Note: const numbers = Array . The start and end indices are optional; if you omit them, the fill operation will default to a start index of 0 and an end index of the array's length. How do I remove a property from a JavaScript object? They have default values of 0 and the length of this object. let filledArray = new Array (10).fill ( {'hello':'goodbye'}); Thank you! end (optional) - End index (default is Array.length ), which is always excluded. How do I put three reasons together in a sentence? Arrays.fill () method is also capable of filling both the 2D and the 3D Arrays. // any additional arguments that will change depending on the filler function. The fill () method, fills the elements of an array with a static value from the specified start position to the specified end position. Stop Googling Git commands and actually learn it! Krunal Lathiya is an Information Technology Engineer. We can add them to the beginning with unshift(). So, we can directly add the element at the last+1 index. How to append HTML code to a div using JavaScript ? Using Mocks for Testing in JavaScript with Sinon.js, JavaScript: Check if First Letter of a String is Upper Case. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. How to compare two arrays in JavaScript ? In this example, we have filled an array with element 80 from index 3 up to the end of the array. Altering the second item of the array filledArray[1].value = 3 alters all the items in the array.. 2.2 Using Array.from() In case if you want the array to fill with copies of the initial object, then you could use the Array.from() utility function.. Array.from(array, mapperFunction) accepts 2 arguments: an array (or generally an iterable), and a mapper function. The Float64Array typed array represents an array of 64-bit floating point numbers (corresponding to the C double data type) in the platform byte order. The end index is not included. Central limit theorem replacing radical n with n. Is it appropriate to ignore emails from a student asking obvious questions? The arr.fill () method is used to fill the array with a given static value. I then might just want to do a bit more when it comes to converting those strings to numbers, but you get the basic idea. We wanted to add 'wednesday' in the weekdays array at the 2nd position. For one thing if I am going to monkey patch an array fill method, then I should stick to a solution such as this one for the array fill method. However in this post I will be sticking to just using javaScript alone as a way to create custom solutions for these sort of things. Another option would be to start the index value off at the given length around and loop backwards which is what I decided to go with for this example. And the additional arguments used beyond the length and filler function will change depending on the filler function that is used. Now, let us take an example. This array fill method is then just yet another useful array prototype method long with other such methods such as array map, reduce, and the for each methods just to name a few. It returns undefined, if no element satisfies the condition. For example I might not always want just an array that is filled with random numbers, but an array that is filed with random values from a given array of values. ; e is the end index in the array, which is an exclusive value. In some cases I might want to just simply fill all element index values in an array with a set static value, or created a new array with a given count of element that are all set to a given starting value. Unless you care a great deal about backward compatibility the native array fill method works just fine, else one may have to use a Polly fill method, or a pony fill method in the form of some kind of user space method of library in order to get code to work on the desired range of platforms including older platforms that may not support this native array fill method. We're going to take an array of weekdays, and add a "wednesday" element between "tuesday" and "thursday": Let's break down the above code. Return. Like any good poly fill it will only monkey path itself in if a native array fill method is not all ready there to begin with by doing a quick feature test first. I have have a number of built in filler functions, and also define my own filler function on the fly when I am in a situation in which I need to do so. This might not be the best way to go about cloning an object in a situations, and getting into the details as to why and with cloning with objects in general is a matter for a whole other post. const tempGirls = Array(5).fill("girl", 0); Note that the array was initially a sparse array with no assigned indices. However when it comes to the subject of filling an array, or creating a new array with a fixed value set for each element the apply method is one tick that can be used to do so. Those start and end values are indexes of an array. How to calculate the number of days between two dates in JavaScript ? When fill() gets an object, it will copy the reference and fill the array with references to that object. To learn more, see our tips on writing great answers. With that said there is the idea of making a kind of custom user space fill library, or some kind of utility library that will contain a fill method along with many other useful methods that I would use in a given project of one kind or another. Do not forget about all the prototype methods in a String that there are to play with such as the String split method. Say, the length of an array is 5, then the last index at which the value will be 4. An element can be added to an array at three places: Let's get started by adding elements to the beginning of an array! When fill gets passed an object, it will copy the reference and fill the array with references to that object. If you do not care about supporting older browser that do not support this method, and you do nit need or what some kind of method that will create the array to begin with then this will work just fine. I can then just use the array bracket syntax and the assignment operator to set each value for the array to the desired static value to fill the array with. Syntax: const array_name = [ item1, item2, . For example I can cerated a filled array by taking any string value and then calling the split method off of that string value and pass an empty string to the spit method, the result of which would then be an array where each element is a single character from that string. This is an optional value. We get even more control of where we place them with the splice() method. Anatomy of Array.fill() The fill() method accepts three arguments: the value to fill the array with, the start index, and the end index. JavaScript fill () method fill () method is used fill the array with a given value. The fill () method changes all elements in an array to a static value, from a start index (default 0) to an end index (default array.length ). The thing to note about this fill method is that it . Arrays fill () method has the following syntax: Java.util.Arrays.fill (boolean[] arr, int fromIndex, int toIndex, boolean val ) Here, Get tutorials, guides, and dev jobs in your inbox. That means if we do not provide the start and end index, it will replace all the values with the provided ones. However for the sake of tha matter at hand here and now all I need is a way to create an independent new object from an object. For example, the following Array has a hole at index 1: > Object.keys ( ['a',, 'c']) [ '0', '2' ] Arrays without holes are also called dense or packed. It creates a new copy of the output and does not affect the original arrays. What I mean is that there is always having a length argument for a function that will create and returned a filled array, but then there are a whole lot of other arguments that will change up a little from one method to the next. I have some js code to make organizational chart. The push() method of an array appends one or more elements to the end of it. This method takes three parameters: value, which we will fill into the array, and start and end, which describe where we want to add the data inside the array. However this all might be a good thing to expand on more in the from of a whole section on its own that centers around the idea of taking this to the nth degree when it comes to making a kind of library for creating filled arrays. The JavaScript Array.fill() Method fills a given range of array elements with the given value. Why is the eastern United States green if the wind moves from west to east? The result is an array of independent objects with the same starting values as the object that I filled with. The array fill() method takes up to a maximum of three arguments: value, start, and end. With that said there is a lot to write about when it comes to this methods and the various ways that they can be used with built in as well as user space methods of class instances. fill () Parameters The fill () method can take 3 parameters: value - Value to fill the array with. seaCreatures[1]; Output squid We know 0 will always output the first item in an array. If the browsers do not support the fill() method, you can write the following code to add to your code and make it work. Here is the list of methods of how javascript find index of object in array: Table Of Contents Using findIndex () Method Using Loop Using find () method with indexOf () Method 1. Both the other arguments are optional. The code weekdays.splice(2, 0, 'wednesday') is read as at the second position, do not remove any element and add wednesday. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Data Structures & Algorithms- Self Paced Course. This is an inclusive value. So then there is filling an array with static values, and then there is filling an array with values that are the result of some kind of pattern, or process, such as a random process, or filled from some kind of data source. 6 0 0 3.9 10 Kurzd 100 points fill (val); fill (val, start); //fills array with value of val at index start fill (val, start, end); //fills array with value of val at index start to index end Thank you! Code - var aa = (new Array (4)).map ( (x, index) => { return index + 1; }); console.log (aa); Output - [undefined, undefined, undefined, undefined] Expected - [1, 2, 3, 4] All rights reserved. JavaScript Array.fill() is a very simple method added in ES6. Not the answer you're looking for? javascript fill function data from multidimensonal array. By using our site, you To wrap this section up I have one last example using a while loop to create a solution for creating a filled array. The fill() method of JavaScript is used to fill the elements in an array with a static value. fill () Syntax The syntax of the fill () method is: arr.fill (value, start, end) Here, arr is an array. So then when using the string split method and empty string can be given. The unshift() method in array objects adds one or more elements to the start of an array. JavaScript-Array.filter-. Find Index Of Object Using findIndex () Method The findIndex () method is used to find the index of an element in an array. The value to fill the array. It means we can set array of n length with some predefined values for all elements instead of null or undefined that are being returned if try to access empty array. Often I might have a string where there is some kind of separator between values that I want to have as elements in an array. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. Before altering the array with the fill() method, slots must be assigned to it.. Start and end position can be specified. That kind of method can come in handy when it comes to creating a new Array filled with something from a string. This is the function: &lt;script&gt; google.charts.load(' Of course there are some that think that a developer should never monkey patch, even for native methods that should be there. What is also great about this kind of approach is that I avoid the problems associated with using the Array constructor with a method such as map that will skip over undefined key index values of an array. 2013-2022 Stack Abuse. fill() - Fills Array with Static Value array1.fill(value) array1.fill(value, start) array1.fill(value, start, end) array1 is an array; value is a static value which is filled in the array; start is the starting index (inclusive) from which filling happens; end is the ending index (exclusive) upto which filling happens; fill() method fills the array with given value from start index upto end . So with that said lets look at some more examples of filling an array in javaScript. In this example I am using the clone object trick that involves using the JSON parse method to parse a JSON string that was just created with the JSON strigify method. JavaScript array fill range Simple example code. Let's create array with length of 5 and filled with zeros. However maybe such things are called for in an additional section in this post later on that has to do with making some kind of user space library that revolves around filling an array. Or maybe the array fill method is just want needs to be used for starters so that it ca then be used with another method like Array.map. To populate an array with a zero or any other value like an object or a string in JavaScript, use the array.fill() method. The native array fill prototype method can be used to quickly fill an array with a single value for each element. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket . If the start and end number is not a number or NaN, then it will not modify the array. Applies to .NET 7 RC 1 and other versions Fill<T> (T [], T) If the start is negative, it is treated as length_start, where length is the arrays length. Read our Privacy Policy. How does Promise.any() method differs from Promise.race() method in JavaScript ? This method modifies the original array. Check if an array is empty or not in JavaScript. The fill () method fills specified elements in an array with a value. Syntax: array.fill (value, [start_index], [end_index]); Parameters: value is a static value to be filled in the array. Hide or show elements in HTML using display property, Difference between var and let in JavaScript. fill () is still able to fill this array. . The value can be used to fill the entire array or it can be used to fill a part of the array. (Note all elements in the array will be this exact value.) Yet another tool in the native tool box of sorts that has to do with creating a filed array would be to use the array from method with a method such as array map. I can just have a starting index value as well as an index value start at the starting index value and loop forward setting each index to a fixed static value, or any value that I want that follows a desired pattern to which I want to fill the array. If you don't provide this value, it takes 0 as default. Learn Lambda, EC2, S3, SQS, and more! In the event that it is not there then it will define the array fill method using the source code worked out for this sort if thing. There is the the question of how to go about converting the array back to a string also, for this there is the array join method. s is the starting index in the array. No element needs to deleted here. When would I give a checkpoint to my D&D party that they can return to if they die? rev2022.12.11.43106. You have entered an incorrect email address! Syntax array. So then I could expand on this example a whole lot more when it comes to adding additional built in functions for creating a filled array. Here, v is the value to fill in the given array. Mit diesem Sixpack knnt ihr euer Dosenregal fr eine Weile aufstocken und msst euch nicht lange mit der Wahl der Farben aufhalten. When it comes to creating an array filled with a set of numbers that go up my a fixed delta value from a starting point upward there is also a lodash range method that can be used to create that kind of array real quick. Required parameter. How to remove a character from string in JavaScript ? What is Array fill () method in JavaScript? The main thing about this array from method is that I can pass it an object that just contains a length property and the result will be an array with all the index values defined with the value undefined, rather than undefined with the value of undefined. "/> By default, it changes the whole array. JavaScript Course | Understanding Code Structure in JavaScript, Introduction to JavaScript Course | Learn how to Build a task tracker using JavaScript, JavaScript Course | Data Types in JavaScript, JavaScript Course | Printing Hello World in JavaScript, JavaScript Course | Operators in JavaScript, JavaScript Course | Functions in JavaScript. startOptional Start index, defaults to 0. endOptional JavaScript array fill method is used to fill the array elements with a particular value. This time it is a solution that is a decent starting point for some kind of full blown library solution centered around this specific topic. If not, all elements will be filled. NBQ Slow "Sixpack - Phoenix" (6x400ml) Ihr braucht mal wieder eine Farbkombi frs Fill-In oder hnliches und knnt euch nicht entscheiden? Unsubscribe at any time. As of this writing I would say that it might still be a good idea to do so, however as aways it will deepened on how far back you want to go with browser, and or nodejs version support. The fill() method is represented by the following syntax: When it comes to making this kind of method I would want to have a length argument, but then some additional arguments that have to do with setting a range for the random numbers as well as a way to customize what will be going on in terms of rounding for the numbers. An array is a linear data structure and arguably one of the most popular data structures used in Computer Science. Or at least this is the first method that comes to mind when it comes to this sort of thing at least. How to convert Set to Array in JavaScript? However what is nice about apply is that it has been around longer, and will still work jusy as well for this sort of thing. This is also optional.By default, it takes the length of the array. count Int32 The number of elements to copy. Array (2).fill ('w3codegenerator'); new Array (5).fill ().map ( () => { return ('w3codegenerator');}) Javascript array fill method Initialise JavaScript array with zeros. JavaScript Array.fill () Method gills a given range of array elements with the given value. Table Of Contents - JavaScript Array Fill Array Fill Method Filling array using Array.map Filling array using Array.from Array Fill Using Loop Other ways to fill array Array Fill With Objects Is energy "equal" to the curvature of spacetime? Example 3: In this example, we will fill the array completely with 6. For now I might just want to have one last example in this section that might prove to be a good starting point for such a project though at least. startIndex Int32 A 32-bit integer that represents the index in the Array at which filling begins. A new Array(3).fill(0) will give you [0, 0, 0]. Connect and share knowledge within a single location that is structured and easy to search. For example I might want to start off an array of numbers to a starting value of zero number value for each element. Let us take a look: The array is 3 in length, and the 2nd element is 3. If the start is greater than the length of an array, then it will not modify any value. WIth all of these examples thus far it would seem that there are a few common things that come up, and then a whole bunch of things that are a little different. Syntax For example : var a = [4,6,3] var b = [6,6,0] how can I find out if the elements at index 1 in both arrays are the same in Javascript or using jQuery? An item in a JavaScript array is accessed by referring to the index number of the item in square brackets. Here, we will discuss how to add an element in any position of an array in JavaScript. var functionName = function() {} vs function functionName() {}, How to insert an item into an array at a specific index (JavaScript). Would salt mines, lakes or flats be reasonably found in high, snowy elevations? How does Promise.all() method differs from Promise.allSettled() method in JavaScript ? So if we change that object like this: filledArray[0].hello = "adios" How to create an image element dynamically using JavaScript ? Return value: It returns the modified array. So then there is the question that if the array fill method is what is being used to fill an array, should a poly fill be used? Creating an Array Using an array literal is the easiest way to create a JavaScript Array. PSE Advent Calendar 2022 (Day 11): The other side of Christmas. Ready to optimize your JavaScript with Rust? Because the fill () method is a method of the Array object, it must be invoked through a particular instance of the Array class. i2c_arm bus initialization and device-tree overlay. This method does not create a new array. The start and end arguments are optional. Save my name, email, and website in this browser for the next time I comment. Array.filter. It returns the modified array. Example 2: In this example, we will fill the array with 9 starting from an index at 2 till the end index of the array. We can concatenate an array with another array: Check out our hands-on, practical guide to learning Git, with best-practices, industry-accepted standards, and included cheat sheet. One way to start out with this is to maybe start with a simple function that will create and return a new array with a given length filled with a given value for each element. So in other words what I am talking about here would be an example of a higher order function that takes a function as an argument. Let's see splice() in action. By profession, he is a web developer with knowledge of multiple back-end platforms (e.g., PHP, Node.js, Python) and frontend JavaScript frameworks (e.g., Angular, React, and Vue). So that means it has replaced the value of 0 indexes with the 4 value. Received a 'behavior reminder' from manager. Let us now implement the fill() method in JavaScript To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How to read a local text file using JavaScript? How to trigger a file download when clicking an HTML button or JavaScript. arr[i] = filler.apply(arr, coreArgu.concat(addArgu)); // [ 6.8, 5.55, 8.1, 1.94, 5.62, 3.32, 4.67, 0.11 ], // fill module that returns a higher order function, // that will take a filler method, or a string value that is used, // create and return an array using the filter function, // core and additional arguments for the filler function, // call filler function using apply for the current index using, // the array for the value of this and passing an array of arguments, // that is a concatenation of core arguments for all filler functions and. fill () Array Method. We have passed element value 80 and start index 3 to the method and assigned the return value . Say, the length of an array is 5, then the last index at which the value will be 4. The index to stop filling the array (default is. -. Now, if you do not provide the start and end index, it will replace the whole array with the provided value. Differences between Functional Components and Class Components in React, Difference between TypeScript and JavaScript, Form validation using HTML and JavaScript. In this example, the value specified in the fill_value replaces all array elements. php check if array index exists; if array index exists php; php array element exist; if array index contains string php; check if string is in list php; php if value in array is set; if value exist in object php; get position of item in array php; php check if any value in array is in another array; php check if string contains array of words . However there are other options that might be a better for this sort of task depending on the situation. Or you can do declarative approach while using Array.from like this: arr = Array.from ( {length: 20}, (e, i)=> i) console.log (arr) Array.from () and Array.keys () require an ES6 polyfill in order to work in all browsers. Syntax: arr.fill (value [, start [, end]]) Parameters: Value: Value to be filled. By default, it changes the whole array. This method does not create a new array but updates the one that called it. There are a number of other options in modern javaScript for doing this sort of thing such as sing the array from method for example. In this article, we looked at many ways in JavaScript we can add elements to an array. When no start_index and end_index is provided in . Fill an Array With Range Using the Array.fill () Function in JavaScript The Array.fill () method fills an existing array with a particular value. The JavaScript array fill() method fills the elements of the given array with the specified static values. In simple. If not, all elements will be filled. How can I remove a specific item from an array? So then there is the idea of making a function that will take two arguments that are a kind of core set of arguments one of which is a desired length of an array and the other is a filler function of a string value to get such a function in terms of one or more built in options for such a function. The fill () method fills specified elements in an array with a value. Looks like you were pretty close; you just need to add a loop to iterate over passedArray. The index to start filling the array (default index is 0), Optional parameter. Finally, at that position, we insert the value of 4. I am new to javascript and want to know if there is a possible method to find out if an element inside an array has the same index as another element inside another array. Optional parameter. Start: Start index (included) and its defaults value is 0. With this example I am filling an array with the same string pattern over and over again once again using the Function apply prototype trick to do so. Now, let us take an example. The fill () method changes all elements in an array to a static value, from a start index (default 0) to an end index (default array.length ). Why does Cauchy's equation for refractive index contain only even power terms? The Array fill () method fills an entire array or part of an array with a value that you pass as a parameter to this method. There is no 3rd element, so we're greeted with undefined. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. The contents are initialized to 0. For example I might want to start off an array with a range of numbers starting with 1 going up from there to the length of the array, and then use this kind of array with another method such as the a map method to create a final array with desired values. let filledArray = new Array(10).fill({'hello':'goodbye'}); No spam ever. Example Codes: Replace All the Elements of an Array With 0 Using JavaScript Array.fill() Method. If you do not have a Github account, and have not yet looked into source control, you might want to take a moment to look into that at some point. fill (value, start, end) One thing to keep in mind is that this method modifies the original/given array. So then I just create a function in which I pass a length and value argument and use that length value as a way to find out if a current index value is below the length or not in order to know if looping should stop or not. Build the foundation you'll need to provision, deploy, and run Node.js applications in the AWS cloud. This is the function: I need to fill data.addRows([.]) with the data from passedArray. It can have holes - indices between zero and the length, that are not mapped to elements ("missing indices"). This is the exact value that will replace the array elements. The fill () method overwrites the original array. How to Open URL in New Tab using JavaScript ? There are a whole lot of other ideas that come to mind when it comes to this kind of method. It can fill the array with a single value or with a range of values. Using fill () to populate an empty array This example shows how to populate an array, setting all elements to a specific value. When it comes to using the modern native array fill method, one can just call it off of an array instance and pass what you want the array to be filled with as the first argument. We can add them to the end using their index, the pop() method and the concat() method. The type of the elements of the array. I might just need to do a bit more when it comes to this such as converting strings to numbers. That means if we do not provide the start and end index, it will replace all the values with the provided ones. The very obvious way will be to create a for loop and initialize an array as shown below: 1let array = [] 2 3for (let index = 0; index < 10; index++) { 4 array.push(1) 5} We will see 3 other methods to fill an array in javascript without explicitly using a for loop. However if I am going to start making my own custom utilities method for a project, then I could go with something like this for a fill method, or I can do whatever else I would want to do when it comes to making such a fill method. How do I check if an array includes a value in JavaScript? However when it just simple comes to just filling an array with a certain static value then the array fill method does the trick just fine. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. However the idea of filling an array with values might have more than one meaning other than just that. Syntax array .fill ( value, start, end) Parameters Return Value Related Pages: Array Tutorial Array Const Array Methods Array Sort Array Iterations We can also find the last item in an array by performing an operation on the length property and applying that as the new index number. Was the ZX Spectrum used for number crunching? The fill () method is used to provide the functionality to assign array values to some specific value. If you are going to monkey patch then it is a good idea to make sure that yo do so with something that is spec compliant and therefor will work the same way as what would otherwise be the actually native method. Making statements based on opinion; back them up with references or personal experience. For example I can have a string that is composed of a count of zeros, and then call the string split method off of that string passing an empty string to the split method while doing so. More so than most people realize! There is then also having one or more methods that have to do with creating a new array filed with random values. The fill()method fills all the elements of an array from a start index to an end index with a static value. This post is no exception and as such the examples in this section as well as the rest of the post can be found there in the folder that corresponds to this post. Using Array.fill method When it comes to filling an array with an object you might run into problems that have to do with references to the same object rather than creating an array of objects. Start and end position can be specified. array.fill(val, start, end) Above, val is the value to fill the array, start is the index to begin filling the array, whereas end is the index to stop filling the array. How do you run JavaScript script through the Terminal? Create a project folder and create one file called app.jsand add the following code inside it. The Javascript Array fill() methods only first argument is required. Just like unshift(), it also returns the new length of the array: Running the above code will display this: Merging or joining of two or more arrays is achieved by an array's concat() method. var numbers = [1, 2, 3] numbers.fill(1); // results in [1, 1, 1] Syntax arr.fill(value)arr.fill(value, start) arr.fill(value, start, end) Parameters value Value to fill an array. Here in this tutorial, we are going to apply fill () function on 1-D, 2-D, and 3-D arrays in Java. Let us understand using codes for each one of them. : +49 (0) 9673 255 Fax: +49 (0) 9673 475 pertl_reisen@t-online.de You see if you just pass an object to a method like array fill then you will end up with an array filled up with references to that same single object. Are the S&P 500 and Dow Jones Industrial Average securities? When it comes to using lodash there is the lodash fill method that works more or less the same way as the native array fill method. I made an array of id's, names, etc; I need to fill the js data array but i can't do it. Here's the general syntax for using splice(): Let's see another example of slice() where we add and delete to the array at the same time. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Create a project folder and create one file called. 1.a : For 1-D array: Calling fill (int array [] , int value) import java.util.Arrays; public class FillExample { public static void main(String[] args) { int array[] = {1,2,3,4,5,6,7,8,9,0}; You see if you just pass an object to a method like array fill then you will end up with an array filled up with references to that same single object. The array.fill() method returns the changed version of the original array.. value T The new value for the elements in the specified range. 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array fill with index javascript