{"id":201134,"date":"2023-12-17T14:09:11","date_gmt":"2023-12-17T14:09:11","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/how-to-change-value-of-array-in-javascript\/"},"modified":"2023-12-17T14:09:11","modified_gmt":"2023-12-17T14:09:11","slug":"how-to-change-value-of-array-in-javascript","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/how-to-change-value-of-array-in-javascript\/","title":{"rendered":"How to change value of array in JavaScript?"},"content":{"rendered":"<p>Arrays are one of the fundamental data structures in JavaScript, allowing us to store multiple values in a single variable. However, changing the value of an array element can sometimes be confusing for beginners. In this article, we will explore the various ways in which we can change the value of an array in JavaScript.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_62 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/namso-gen.co\/blog\/how-to-change-value-of-array-in-javascript\/#How_to_change_value_of_array_in_JavaScript\" title=\"How to change value of array in JavaScript?\">How to change value of array in JavaScript?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/namso-gen.co\/blog\/how-to-change-value-of-array-in-javascript\/#How_to_change_multiple_values_in_an_array_at_once\" title=\"How to change multiple values in an array at once?\">How to change multiple values in an array at once?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/namso-gen.co\/blog\/how-to-change-value-of-array-in-javascript\/#How_to_change_the_last_element_of_an_array\" title=\"How to change the last element of an array?\">How to change the last element of an array?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/namso-gen.co\/blog\/how-to-change-value-of-array-in-javascript\/#How_to_change_values_in_a_multidimensional_array\" title=\"How to change values in a multidimensional array?\">How to change values in a multidimensional array?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/namso-gen.co\/blog\/how-to-change-value-of-array-in-javascript\/#How_to_change_the_value_of_an_array_using_a_loop\" title=\"How to change the value of an array using a loop?\">How to change the value of an array using a loop?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/namso-gen.co\/blog\/how-to-change-value-of-array-in-javascript\/#How_to_change_the_value_of_an_array_in_a_functional_way\" title=\"How to change the value of an array in a functional way?\">How to change the value of an array in a functional way?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/namso-gen.co\/blog\/how-to-change-value-of-array-in-javascript\/#How_to_change_the_value_of_an_array_only_if_a_certain_condition_is_met\" title=\"How to change the value of an array only if a certain condition is met?\">How to change the value of an array only if a certain condition is met?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/namso-gen.co\/blog\/how-to-change-value-of-array-in-javascript\/#How_to_change_the_value_of_an_array_without_mutating_the_original_array\" title=\"How to change the value of an array without mutating the original array?\">How to change the value of an array without mutating the original array?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/namso-gen.co\/blog\/how-to-change-value-of-array-in-javascript\/#How_to_change_the_value_of_an_array_element_using_destructuring\" title=\"How to change the value of an array element using destructuring?\">How to change the value of an array element using destructuring?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/namso-gen.co\/blog\/how-to-change-value-of-array-in-javascript\/#How_to_change_the_value_of_an_array_element_conditionally_using_map_and_ternary_operator\" title=\"How to change the value of an array element conditionally using map() and ternary operator?\">How to change the value of an array element conditionally using map() and ternary operator?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/namso-gen.co\/blog\/how-to-change-value-of-array-in-javascript\/#How_to_change_the_value_of_an_array_element_using_the_array_index\" title=\"How to change the value of an array element using the array index?\">How to change the value of an array element using the array index?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/namso-gen.co\/blog\/how-to-change-value-of-array-in-javascript\/#How_to_change_the_value_of_an_array_element_using_the_pop_and_push_methods\" title=\"How to change the value of an array element using the pop and push methods?\">How to change the value of an array element using the pop and push methods?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/namso-gen.co\/blog\/how-to-change-value-of-array-in-javascript\/#How_to_change_the_value_of_an_array_element_using_the_shift_and_unshift_methods\" title=\"How to change the value of an array element using the shift and unshift methods?\">How to change the value of an array element using the shift and unshift methods?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/namso-gen.co\/blog\/how-to-change-value-of-array-in-javascript\/#How_to_change_the_value_of_an_array_element_using_the_indexOf_method\" title=\"How to change the value of an array element using the indexOf() method?\">How to change the value of an array element using the indexOf() method?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"How_to_change_value_of_array_in_JavaScript\"><\/span>How to change value of array in JavaScript?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>**To change the value of an array in JavaScript, you can simply access the desired index of the array and assign it a new value.**<\/p>\n<p>Let&#8217;s look at a simple example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet myArray = [1, 2, 3, 4, 5];<br \/>\nmyArray[2] = 10;<br \/>\nconsole.log(myArray); \/\/ Output: [1, 2, 10, 4, 5]<br \/>\n&#8220;`<\/p>\n<p>In this example, we changed the value of the element at index 2 from 3 to 10.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_change_multiple_values_in_an_array_at_once\"><\/span>How to change multiple values in an array at once?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To change multiple values in an array at once, you can use the splice() method along with the spread operator (&#8230;). Here is an example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet myArray = [1, 2, 3, 4, 5];<br \/>\nmyArray.splice(1, 2, 8, 9);<br \/>\nconsole.log(myArray); \/\/ Output: [1, 8, 9, 4, 5]<br \/>\n&#8220;`<\/p>\n<p>In this example, we replaced the elements at index 1 and 2 with 8 and 9, respectively.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_change_the_last_element_of_an_array\"><\/span>How to change the last element of an array?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To change the last element of an array, you can use the array length property. Here is an example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet myArray = [1, 2, 3, 4, 5];<br \/>\nmyArray[myArray.length &#8211; 1] = 10;<br \/>\nconsole.log(myArray); \/\/ Output: [1, 2, 3, 4, 10]<br \/>\n&#8220;`<\/p>\n<p>In this example, we changed the value of the last element in the array from 5 to 10.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_change_values_in_a_multidimensional_array\"><\/span>How to change values in a multidimensional array?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To change values in a multidimensional array, you need to access the elements by their indices. Here is an example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet myArray = [[1, 2], [3, 4]];<br \/>\nmyArray[1][0] = 5;<br \/>\nconsole.log(myArray); \/\/ Output: [[1, 2], [5, 4]]<br \/>\n&#8220;`<\/p>\n<p>In this example, we changed the value at index [1][0] from 3 to 5.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_change_the_value_of_an_array_using_a_loop\"><\/span>How to change the value of an array using a loop?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can change the values of an array using a loop such as a for loop or a forEach method. Here is an example using a for loop:<\/p>\n<p>&#8220;`javascript<br \/>\nlet myArray = [1, 2, 3, 4, 5];<br \/>\nfor (let i = 0; i < myArray.length; i++) {<br \/>\n  myArray[i] *= 2;<br \/>\n}<br \/>\nconsole.log(myArray); \/\/ Output: [2, 4, 6, 8, 10]<br \/>\n&#8220;`<\/p>\n<p>In this example, we multiplied each element in the array by 2.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_change_the_value_of_an_array_in_a_functional_way\"><\/span>How to change the value of an array in a functional way?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can use array methods like map(), filter(), or reduce() to change the values of an array in a functional way. Here is an example using the map() method:<\/p>\n<p>&#8220;`javascript<br \/>\nlet myArray = [1, 2, 3, 4, 5];<br \/>\nlet newArray = myArray.map(num => num * 2);<br \/>\nconsole.log(newArray); \/\/ Output: [2, 4, 6, 8, 10]<br \/>\n&#8220;`<\/p>\n<p>In this example, we created a new array by multiplying each element in the original array by 2.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_change_the_value_of_an_array_only_if_a_certain_condition_is_met\"><\/span>How to change the value of an array only if a certain condition is met?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can use array methods like map(), filter(), or forEach() along with conditional statements to change the values of an array only if a certain condition is met. Here is an example using the filter() method:<\/p>\n<p>&#8220;`javascript<br \/>\nlet myArray = [1, 2, 3, 4, 5];<br \/>\nlet newArray = myArray.filter(num => num % 2 === 0);<br \/>\nconsole.log(newArray); \/\/ Output: [2, 4]<br \/>\n&#8220;`<\/p>\n<p>In this example, we created a new array containing only the even numbers from the original array.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_change_the_value_of_an_array_without_mutating_the_original_array\"><\/span>How to change the value of an array without mutating the original array?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can use array methods like concat() or slice() to create a new array with the changes without mutating the original array. Here is an example using the concat() method:<\/p>\n<p>&#8220;`javascript<br \/>\nlet myArray = [1, 2, 3, 4, 5];<br \/>\nlet newArray = myArray.concat(6);<br \/>\nconsole.log(newArray); \/\/ Output: [1, 2, 3, 4, 5, 6]<br \/>\nconsole.log(myArray); \/\/ Output: [1, 2, 3, 4, 5]<br \/>\n&#8220;`<\/p>\n<p>In this example, we created a new array by appending a new element to the original array without changing it.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_change_the_value_of_an_array_element_using_destructuring\"><\/span>How to change the value of an array element using destructuring?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can use array destructuring to change the value of an array element. Here is an example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet myArray = [1, 2, 3, 4, 5];<br \/>\nlet [first, second, &#8230;rest] = myArray;<br \/>\nsecond = 10;<br \/>\nconsole.log([first, second, &#8230;rest]); \/\/ Output: [1, 10, 3, 4, 5]<br \/>\n&#8220;`<\/p>\n<p>In this example, we changed the value of the second element in the array using array destructuring.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_change_the_value_of_an_array_element_conditionally_using_map_and_ternary_operator\"><\/span>How to change the value of an array element conditionally using map() and ternary operator?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can use the map() method along with the ternary operator to change the value of an array element conditionally. Here is an example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet myArray = [1, 2, 3, 4, 5];<br \/>\nlet newArray = myArray.map(num => num % 2 === 0 ? num * 2 : num);<br \/>\nconsole.log(newArray); \/\/ Output: [1, 4, 3, 8, 5]<br \/>\n&#8220;`<\/p>\n<p>In this example, we doubled the even numbers in the array while leaving the odd numbers unchanged.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_change_the_value_of_an_array_element_using_the_array_index\"><\/span>How to change the value of an array element using the array index?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can directly access the array element using its index to change its value. Here is an example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet myArray = [1, 2, 3, 4, 5];<br \/>\nmyArray[3] = 20;<br \/>\nconsole.log(myArray); \/\/ Output: [1, 2, 3, 20, 5]<br \/>\n&#8220;`<\/p>\n<p>In this example, we changed the value of the element at index 3 from 4 to 20.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_change_the_value_of_an_array_element_using_the_pop_and_push_methods\"><\/span>How to change the value of an array element using the pop and push methods?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can use the pop() and push() methods to remove and add elements to the end of an array, effectively changing the value of the last element. Here is an example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet myArray = [1, 2, 3, 4, 5];<br \/>\nmyArray.pop();<br \/>\nmyArray.push(10);<br \/>\nconsole.log(myArray); \/\/ Output: [1, 2, 3, 4, 10]<br \/>\n&#8220;`<\/p>\n<p>In this example, we changed the value of the last element in the array from 5 to 10 using pop() and push() methods.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_change_the_value_of_an_array_element_using_the_shift_and_unshift_methods\"><\/span>How to change the value of an array element using the shift and unshift methods?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can use the shift() and unshift() methods to remove and add elements to the beginning of an array, effectively changing the value of the first element. Here is an example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet myArray = [1, 2, 3, 4, 5];<br \/>\nmyArray.shift();<br \/>\nmyArray.unshift(10);<br \/>\nconsole.log(myArray); \/\/ Output: [10, 2, 3, 4, 5]<br \/>\n&#8220;`<\/p>\n<p>In this example, we changed the value of the first element in the array from 1 to 10 using shift() and unshift() methods.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_change_the_value_of_an_array_element_using_the_indexOf_method\"><\/span>How to change the value of an array element using the indexOf() method?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can use the indexOf() method to find the index of a specific element in an array and then change its value. Here is an example:<\/p>\n<p>&#8220;`javascript<br \/>\nlet myArray = [1, 2, 3, 4, 5, 3];<br \/>\nlet index = myArray.indexOf(3);<br \/>\nif(index !== -1) {<br \/>\n  myArray[index] = 10;<br \/>\n}<br \/>\nconsole.log(myArray); \/\/ Output: [1, 2, 10, 4, 5, 3]<br \/>\n&#8220;`<\/p>\n<p>In this example, we changed the value of the first occurrence of 3 in the array to 10 using the indexOf() method.<\/p>\n<p>Changing the value of an array element in JavaScript is a common operation, and there are many different ways to achieve this. Whether you need to change a single element or multiple elements in an array, JavaScript provides a variety of methods and techniques to help you accomplish your goal.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Arrays are one of the fundamental data structures in JavaScript, allowing us to store multiple values in a single variable. However, changing the value of an array element can sometimes be confusing for beginners. In this article, we will explore the various ways in which we can change the value of an array in JavaScript. &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"How to change value of array in JavaScript?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/how-to-change-value-of-array-in-javascript\/#more-201134\">Read more<span class=\"screen-reader-text\">How to change value of array in JavaScript?<\/span><\/a><\/p>\n","protected":false},"author":51,"featured_media":107420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86279],"tags":[],"class_list":["post-201134","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to change value of array in JavaScript?<\/title>\n<meta name=\"description\" content=\"Arrays are one of the fundamental data structures in JavaScript, allowing us to store multiple values in a single variable. 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