let arr = array1.concat(array2); How to Append an Item to an Array in JavaScript In this tutorial, you will find out the solutions that JavaScript offers for appending an item to an array. let colors = ["Red", "Blue", "Orange"]; You can also add multiple elements to an array using. To insert elements in the middle of an array you can use the splice() method which can be used for appending or removing elements from an array. colors.unshift("Black", "Green"); Finally, we logged the updated array to the console using console.log(). Array.prototype.push() - JavaScript | MDN (mozilla.org) The push () method appends values to an array. Each method has its own advantages and disadvantages, and the choice of which method to use depends on the specific requirements of the project. Here is the syntax of the unshift() method. // append new value to the array let colors = ["Red", "Blue", "Orange"]; (When those characteristics are undesirable, use typed arrays instead.) The spread operator () is a powerful feature in JavaScript that allows developers to expand an array into individual elements. In this example, we used the spread operator () to append the elements of the newNumbers array to the beginning of the numbers array. ]; It is a common practice to declare arrays with the const keyword. Then, we appended the string 'mango' to the end of the array. The other parameters ("Black", "Yellow") define the new elements to be added. Commentdocument.getElementById("comment").setAttribute( "id", "a11c9e3d6d29155fe91e57762bacc0cb" );document.getElementById("gd19b63e6e").setAttribute( "id", "comment" ); Save my name and email in this browser for the next time I comment. 20 Answers Sorted by: 2068 The .push method can take multiple arguments. Sometimes you need to append one or more new values at the end of an array. Now to some examples. Creating an Array Using an array literal is the easiest way to create a JavaScript Array. It accepts multiple arguments, attaches the indexes of existing elements, and finally returns the new length of an array. index.js const arr1 = ['a', 'b']; const arr2 = ['c', 'd']; const arr3 = [.arr1, .arr2]; console.log(arr3); // ['a', 'b', 'c', 'd'] Notify me via e-mail if anyone answers my comment. The push() method is a built-in JavaScript method that allows developers to append elements to the end of an array. We covered the push() method, the unshift() method, the spread operator, and the concat() method. Another method is used for appending an element to the beginning of an array is the unshift() function, which adds and returns the new length. Array.prototype.unshift () has similar behavior to push (), but applied to the start of an array. In the example above, the first parameter (2) defines the position where new elements should be added (spliced in). One of the most commonly used methods to append to an array in JavaScript is the push () method. Where the array is the element we want to append to, and the elements are what we want to append to the array. colors.splice(2, 0, "Black", "Yellow"); Now, using the same examples as in the push() section, we will append a new element to the array. console.log('Array after unshift : ' + colors); let array1 = ["Red", "Orange", "Green"]; console.log('Array after splice: ' + colors); How To Add New Elements To A JavaScript Array, How to Move an Array Element from One Array Position to Another, How to Find the Min/Max Elements in an Array in JavaScript, How to Remove Empty Elements from an Array in Javascript, How to Remove an Element from an Array in JavaScript, How to Create a Two Dimensional Array in JavaScript, How to Insert an Item into an Array at a Specific Index, How to Declare and Initialize an Array in JavaScript, How to Append an Item to an Array in JavaScript, How to Copy Array Items into Another Array. [SOLVED], How to check if undefined in JavaScript? Finally, we logged the updated numbers array to the console. When you use the splice() method to add elements to an array, the second argument would be zero. The concat() method is another built-in JavaScript method that allows developers to concatenate arrays. There are certainly many other options for adding elements to an array, and I invite you to go out and find some more great array methods! The concat method is one of the methods that is used to add elements to an array. Syntax: const array_name = [ item1, item2, . where the array is the array we want to append elements to, and element1 and elementN are the elements we are append to array. [SOLVED], How to use JavaScript toFixed() Method? In this example, we used the spread operator () to expand the fruits array into individual elements. console.log('Array before unshift: ' + colors); // append new value to the array Description In JavaScript, arrays aren't primitives but are instead Array objects with the following core characteristics: JavaScript arrays are resizable and can contain a mix of different data types. For any other feedbacks or questions you can either use the comments section or contact me form. Finally, we assigned the updated array back to the numbers variable. console.log('Array after push : ' + colors); The new item(s) will be added only at the end of the Array. The push() method is an in-built JavaScript method that is used to add a number, string, object, array, or any value to the Array. In this example, we used the spread operator () to expand the numbers and newNumbers arrays into individual elements. Finally, we assigned the concatenated array to the allFruits variable and logged it to the console. Spread syntax () - JavaScript | MDN (mozilla.org) In the example above, we first declared an array of fruits. In this article, we will discuss various methods to append to an array in JavaScript. Other ways that a person might word this question: Add an array to another Concat / Concatenate arrays Extend an array with another array Put the contents of one array into another array In this example, we used the unshift() method to append the string 'mango' to the beginning of the fruits array. colors.push("Green"); And you can add arrays together using concat (). Arrays are an essential part of any programming language, and JavaScript is no exception. In this case, the push () method, provided by the array object can help you. to unpack the values of the two arrays into a third array. Definition and Usage The push () method adds new items to the end of an array. It accepts multiple arguments, attaches the indexes of existing elements, and finally returns the new length of an array. The push () method changes the length of the array. How to append an array to an existing JavaScript Array? If you need to add an element to the beginning of your array, try unshift (). When you want to add an element to the end of your array, use push (). console.log('Array before splice: ' + colors); console.log('Array before push: ' + colors); The push () method returns the new length. If my articles on GoLinuxCloud has helped you, kindly consider buying me a coffee as a token of appreciation. In this article, we explored different methods to append elements to arrays using JavaScript. The push () method is a built-in JavaScript method that allows developers to append elements to the end of an array. Before we go on, lets know the syntax of the push() method. How do you append an array to another array in JavaScript? One common requirement when working with arrays is to add new elements to the array. You also can use the concat() function, which merges two or more arrays. Then, we used the push() method to append the string 'tangerine' to the end of the array. The spread syntax will return a new array by appending the second array to the first array. Then, we concatenated the arrays using the spread operator again. Unto another example. So, it would be best if you act as follows: There are several methods for adding new elements to a JavaScript array. // append new value to the array [SOLVED], Using the push() Method to Append to Array, Example 2: Appending Array Elements to Arrays, Using the unshift() Method to Append to Array, Using the Spread Operator to Append to Array, Using the concat() Method to Append to Array, Array.prototype.push() - JavaScript | MDN (mozilla.org), Spread syntax () - JavaScript | MDN (mozilla.org), Array.prototype.concat() - JavaScript | MDN (mozilla.org). To append one array to another: Use the spread syntax (.) where the array is the element we want to append elements to and the element1 and elementN are elements we will append to the beginning of the array. Here's the first example, showing how you can append an element to an array using the splice method: let myArr = [2, 4, 6]; myArr.splice(3,0,8) console.log(myArr); // [ 2, 4, 6, 8 ] Let's break the code above down to its simplest form. Starting with the indexes - the array had three items initially: 2 => index 0 4 => index 1 6 => index 2 Now, lets illustrate using the push() method to append to array in JavaScript. console.log('array2: ' + array2); let array2 = ["Black", "Yellow"]; Try it Syntax concat() concat(value0) concat(value0, value1) concat(value0, value1, /* ,*/ valueN) Parameters valueN Optional Arrays and/or values to concatenate into a new array. One of the most commonly used methods to append to an array in JavaScript is the push() method. See Also: The Array pop () Method The Array shift () Method The Array unshift () Method Syntax array .push ( item1, item2, ., itemX) Parameters Return Value More Examples We used the spread operator () to append the elements of the newNumbers array to the end of the numbers array. How to use JavaScript Set add() Method? Array.prototype.concat() - JavaScript | MDN (mozilla.org), Didn't find what you were looking for? The solution is an array! console.log('array: ' + arr); let colors = ["Red", "Orange", "Green", "Blue"]; In this situation the push () method is what you need. You can use the push() function that adds new items to the end of an array and returns the new length. Javascript array unshift element The concat () method is used to merge two or more arrays. It changes the length and the content of this. The unshift() method is another built-in JavaScript method that allows developers to append elements to the beginning of an array. You can use the spread operator to pass all the elements of the second array as arguments to .push: >>> a.push (.b) If your browser does not support ECMAScript 6, you can use .apply instead: I think you want this, just push an object into an array and with the help of map method loop through the array to replace your keys with your desired ones var raw_data = { name: "Mike", age: "27", }; var array_data = []; array_data.push(raw_data); var new_array = array_data.map(item => { return { email: item.name, password: item.age . The push () method is a mutating method. The third and subsequent arguments are elements that should be added to the Array. console.log('array1: ' + array1); In this example, we used the concat() method to concatenate the fruits and newFruits arrays. // append new value to the array The push () method will add one or more arguments at the end of an array in JavaScript: let arr = [0, 1, 2, 3]; arr.push(4); console.log(arr); // [0, 1, 2, 3, 4] In this example, we have two arrays: numbers and newNumbers. Let's define them. Array - JavaScript | MDN (mozilla.org) Another method is used for appending an element to the beginning of an array is the unshift () function, which adds and returns the new length. Finally, we assigned the updated array back to the fruits variable. Here is the syntax of using the spread operator () to append to array. Arrays in JavaScript are used to store multiple values in a single variable. This method adds one or more elements to the end of an array and returns the new length of the array. 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