{"id":228838,"date":"2024-04-01T06:50:05","date_gmt":"2024-04-01T06:50:05","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/?p=228838"},"modified":"2024-04-01T06:50:05","modified_gmt":"2024-04-01T06:50:05","slug":"how-to-loop-through-key-value-pair-in-javascript","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/how-to-loop-through-key-value-pair-in-javascript\/","title":{"rendered":"How to loop through key-value pair in JavaScript?"},"content":{"rendered":"<p>When working with objects in JavaScript, it is often necessary to loop through the key-value pairs of an object. This can be done using several techniques available in the language. In this article, we will discuss some of the commonly used approaches to accomplish this task.<\/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-loop-through-key-value-pair-in-javascript\/#Using_the_for%E2%80%A6in_loop\" title=\"Using the for&#8230;in loop\">Using the for&#8230;in loop<\/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-loop-through-key-value-pair-in-javascript\/#How_to_loop_through_key-value_pairs_if_the_object_contains_inherited_properties\" title=\"How to loop through key-value pairs if the object contains inherited properties?\">How to loop through key-value pairs if the object contains inherited properties?<\/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-loop-through-key-value-pair-in-javascript\/#How_to_loop_through_key-value_pairs_in_a_specific_order\" title=\"How to loop through key-value pairs in a specific order?\">How to loop through key-value pairs in a specific order?<\/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-loop-through-key-value-pair-in-javascript\/#How_to_loop_through_key-value_pairs_using_Objectentries\" title=\"How to loop through key-value pairs using Object.entries()?\">How to loop through key-value pairs using Object.entries()?<\/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-loop-through-key-value-pair-in-javascript\/#How_to_loop_through_key-value_pairs_in_reverse\" title=\"How to loop through key-value pairs in reverse?\">How to loop through key-value pairs in reverse?<\/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-loop-through-key-value-pair-in-javascript\/#How_to_loop_through_key-value_pairs_in_ES5\" title=\"How to loop through key-value pairs in ES5?\">How to loop through key-value pairs in ES5?<\/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-loop-through-key-value-pair-in-javascript\/#How_to_loop_through_key-value_pairs_using_ArrayforEach_method\" title=\"How to loop through key-value pairs using Array.forEach() method?\">How to loop through key-value pairs using Array.forEach() method?<\/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-loop-through-key-value-pair-in-javascript\/#How_to_loop_through_key-value_pairs_using_Arrayreduce_method\" title=\"How to loop through key-value pairs using Array.reduce() method?\">How to loop through key-value pairs using Array.reduce() method?<\/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-loop-through-key-value-pair-in-javascript\/#How_to_loop_through_key-value_pairs_using_lodash\" title=\"How to loop through key-value pairs using lodash?\">How to loop through key-value pairs using lodash?<\/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-loop-through-key-value-pair-in-javascript\/#How_to_break_the_loop_when_a_specific_condition_is_met\" title=\"How to break the loop when a specific condition is met?\">How to break the loop when a specific condition is met?<\/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-loop-through-key-value-pair-in-javascript\/#How_to_skip_an_iteration_of_the_loop\" title=\"How to skip an iteration of the loop?\">How to skip an iteration of the loop?<\/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-loop-through-key-value-pair-in-javascript\/#How_to_loop_through_a_nested_object\" title=\"How to loop through a nested object?\">How to loop through a nested object?<\/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-loop-through-key-value-pair-in-javascript\/#How_to_loop_through_key-value_pairs_in_an_ES6_Map\" title=\"How to loop through key-value pairs in an ES6 Map?\">How to loop through key-value pairs in an ES6 Map?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Using_the_for%E2%80%A6in_loop\"><\/span>Using the for&#8230;in loop<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The <b>for&#8230;in loop<\/b> is one of the most popular methods to iterate through the key-value pairs of an object in JavaScript. It allows you to loop over all enumerable properties of an object and access their values. Here&#8217;s an example:<\/p>\n<p>&#8220;`javascript<br \/>\n\/\/ Create an object<br \/>\nconst person = {<br \/>\n  name: &#8216;John&#8217;,<br \/>\n  age: 30,<br \/>\n  occupation: &#8216;Developer&#8217;<br \/>\n};<\/p>\n<p>\/\/ Loop through the object&#8217;s properties<br \/>\nfor (const key in person) {<br \/>\n  \/\/ Access the key and value<br \/>\n  console.log(key, person[key]);<br \/>\n}<br \/>\n&#8220;`<\/p>\n<p>This will output:<\/p>\n<p>&#8220;`<br \/>\nname John<br \/>\nage 30<br \/>\noccupation Developer<br \/>\n&#8220;`<\/p>\n<p>Using the <b>for&#8230;in loop<\/b>, you can access each key in the object and retrieve its corresponding value.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_loop_through_key-value_pairs_if_the_object_contains_inherited_properties\"><\/span>How to loop through key-value pairs if the object contains inherited properties?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>When using the <b>for&#8230;in loop<\/b>, inherited properties of an object are also iterated. To avoid this, you can check if the property belongs to the object itself using the <code>hasOwnProperty()<\/code> method. Here&#8217;s an example:<\/p>\n<p>&#8220;`javascript<br \/>\nfor (const key in object) {<br \/>\n  if (object.hasOwnProperty(key)) {<br \/>\n    console.log(key, object[key]);<br \/>\n  }<br \/>\n}<br \/>\n&#8220;`<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_loop_through_key-value_pairs_in_a_specific_order\"><\/span>How to loop through key-value pairs in a specific order?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>In JavaScript, object properties do not have an inherent order. However, if you wish to loop through key-value pairs in a specific order, you can maintain a separate array of keys and use it to iterate over the object. Here&#8217;s an example:<\/p>\n<p>&#8220;`javascript<br \/>\nconst keys = [&#8216;name&#8217;, &#8216;age&#8217;, &#8216;occupation&#8217;];<\/p>\n<p>for (const key of keys) {<br \/>\n  console.log(key, object[key]);<br \/>\n}<br \/>\n&#8220;`<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_loop_through_key-value_pairs_using_Objectentries\"><\/span>How to loop through key-value pairs using Object.entries()?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>The <b>Object.entries()<\/b> method returns an array with key-value pairs of an object. You can use this method in conjunction with a for&#8230;of loop to loop through the pairs. Here&#8217;s an example:<\/p>\n<p>&#8220;`javascript<br \/>\nconst object = {<br \/>\n  name: &#8216;John&#8217;,<br \/>\n  age: 30,<br \/>\n  occupation: &#8216;Developer&#8217;<br \/>\n};<\/p>\n<p>\/\/ Loop through the key-value pairs<br \/>\nfor (const [key, value] of Object.entries(object)) {<br \/>\n  console.log(key, value);<br \/>\n}<br \/>\n&#8220;`<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_loop_through_key-value_pairs_in_reverse\"><\/span>How to loop through key-value pairs in reverse?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>JavaScript objects do not guarantee the order of their properties, so there is no built-in way to loop through key-value pairs in reverse. However, you can use the <b>Object.entries()<\/b> method discussed earlier to convert the object into an array of key-value pairs and then reverse the array using the <b>reverse()<\/b> method. Here&#8217;s an example:<\/p>\n<p>&#8220;`javascript<br \/>\nconst object = {<br \/>\n  name: &#8216;John&#8217;,<br \/>\n  age: 30,<br \/>\n  occupation: &#8216;Developer&#8217;<br \/>\n};<\/p>\n<p>\/\/ Reverse the key-value pairs array<br \/>\nconst reversedPairs = Object.entries(object).reverse();<\/p>\n<p>\/\/ Loop through the reversed key-value pairs<br \/>\nfor (const [key, value] of reversedPairs) {<br \/>\n  console.log(key, value);<br \/>\n}<br \/>\n&#8220;`<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_loop_through_key-value_pairs_in_ES5\"><\/span>How to loop through key-value pairs in ES5?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>In ES5, you can loop through key-value pairs using the <b>Object.keys()<\/b> method to get an array of keys and then iterate over it using a for loop to access the corresponding values. Here&#8217;s an example:<\/p>\n<p>&#8220;`javascript<br \/>\nvar object = {<br \/>\n  name: &#8216;John&#8217;,<br \/>\n  age: 30,<br \/>\n  occupation: &#8216;Developer&#8217;<br \/>\n};<\/p>\n<p>\/\/ Loop through the object&#8217;s properties<br \/>\nObject.keys(object).forEach(function(key) {<br \/>\n  console.log(key, object[key]);<br \/>\n});<br \/>\n&#8220;`<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_loop_through_key-value_pairs_using_ArrayforEach_method\"><\/span>How to loop through key-value pairs using Array.forEach() method?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>You can use the <b>Array.forEach()<\/b> method to iterate over the keys of an object and access their values. Here&#8217;s an example:<\/p>\n<p>&#8220;`javascript<br \/>\nconst object = {<br \/>\n  name: &#8216;John&#8217;,<br \/>\n  age: 30,<br \/>\n  occupation: &#8216;Developer&#8217;<br \/>\n};<\/p>\n<p>\/\/ Loop through the object&#8217;s properties<br \/>\nObject.keys(object).forEach(function(key) {<br \/>\n  console.log(key, object[key]);<br \/>\n});<br \/>\n&#8220;`<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_loop_through_key-value_pairs_using_Arrayreduce_method\"><\/span>How to loop through key-value pairs using Array.reduce() method?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>The <b>Array.reduce()<\/b> method can be used to accumulate the key-value pairs of an object into a single value. Here&#8217;s an example:<\/p>\n<p>&#8220;`javascript<br \/>\nconst object = {<br \/>\n  name: &#8216;John&#8217;,<br \/>\n  age: 30,<br \/>\n  occupation: &#8216;Developer&#8217;<br \/>\n};<\/p>\n<p>\/\/ Loop through the object&#8217;s properties<br \/>\nconst result = Object.keys(object).reduce(function(acc, key) {<br \/>\n  return acc + key + &#8216;: &#8216; + object[key] + &#8216;, &#8216;;<br \/>\n}, &#8221;);<\/p>\n<p>console.log(result);<br \/>\n&#8220;`<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_loop_through_key-value_pairs_using_lodash\"><\/span>How to loop through key-value pairs using lodash?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>Lodash is a popular JavaScript utility library that provides a <b>forEach()<\/b> function specifically designed for iterating over the properties of an object. Here&#8217;s an example:<\/p>\n<p>&#8220;`javascript<br \/>\nconst _ = require(&#8216;lodash&#8217;);<\/p>\n<p>const object = {<br \/>\n  name: &#8216;John&#8217;,<br \/>\n  age: 30,<br \/>\n  occupation: &#8216;Developer&#8217;<br \/>\n};<\/p>\n<p>\/\/ Loop through the object&#8217;s properties using lodash<br \/>\n_.forEach(object, function(value, key) {<br \/>\n  console.log(key, value);<br \/>\n});<br \/>\n&#8220;`<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_break_the_loop_when_a_specific_condition_is_met\"><\/span>How to break the loop when a specific condition is met?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>To break the loop when a specific condition is met, you can use the <b>break<\/b> statement within the loop&#8217;s body. Here&#8217;s an example:<\/p>\n<p>&#8220;`javascript<br \/>\nfor (const key in object) {<br \/>\n  if (object[key] === targetValue) {<br \/>\n    console.log(key, object[key]);<br \/>\n    break;<br \/>\n  }<br \/>\n}<br \/>\n&#8220;`<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_skip_an_iteration_of_the_loop\"><\/span>How to skip an iteration of the loop?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>To skip an iteration of the loop, you can use the <b>continue<\/b> statement within the loop&#8217;s body. Here&#8217;s an example:<\/p>\n<p>&#8220;`javascript<br \/>\nfor (const key in object) {<br \/>\n  if (key === &#8216;age&#8217;) {<br \/>\n    continue;<br \/>\n  }<\/p>\n<p>  console.log(key, object[key]);<br \/>\n}<br \/>\n&#8220;`<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_loop_through_a_nested_object\"><\/span>How to loop through a nested object?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>To loop through a nested object, you can use a combination of nested for&#8230;in loops. Here&#8217;s an example:<\/p>\n<p>&#8220;`javascript<br \/>\nconst object = {<br \/>\n  person: {<br \/>\n    name: &#8216;John&#8217;,<br \/>\n    age: 30<br \/>\n  },<br \/>\n  occupation: &#8216;Developer&#8217;<br \/>\n};<\/p>\n<p>\/\/ Loop through the object&#8217;s properties<br \/>\nfor (const key in object) {<br \/>\n  if (typeof object[key] === &#8216;object&#8217;) {<br \/>\n    for (const nestedKey in object[key]) {<br \/>\n      console.log(nestedKey, object[key][nestedKey]);<br \/>\n    }<br \/>\n  } else {<br \/>\n    console.log(key, object[key]);<br \/>\n  }<br \/>\n}<br \/>\n&#8220;`<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_loop_through_key-value_pairs_in_an_ES6_Map\"><\/span>How to loop through key-value pairs in an ES6 Map?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>In ES6, you can use the <b>Map.entries()<\/b> method to iterate over the key-value pairs of a Map object. Here&#8217;s an example:<\/p>\n<p>&#8220;`javascript<br \/>\nconst map = new Map();<br \/>\nmap.set(&#8216;name&#8217;, &#8216;John&#8217;);<br \/>\nmap.set(&#8216;age&#8217;, 30);<br \/>\nmap.set(&#8216;occupation&#8217;, &#8216;Developer&#8217;);<\/p>\n<p>\/\/ Loop through the Map&#8217;s key-value pairs<br \/>\nfor (const [key, value] of map.entries()) {<br \/>\n  console.log(key, value);<br \/>\n}<br \/>\n&#8220;`<\/p>\n<p>Looping through key-value pairs in JavaScript objects is a common requirement when working with data. By utilizing techniques like the for&#8230;in loop, Object.entries(), or utility libraries like Lodash, you can easily access and manipulate key-value pairs according to your needs.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When working with objects in JavaScript, it is often necessary to loop through the key-value pairs of an object. This can be done using several techniques available in the language. In this article, we will discuss some of the commonly used approaches to accomplish this task. Using the for&#8230;in loop The for&#8230;in loop is one &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"How to loop through key-value pair in JavaScript?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/how-to-loop-through-key-value-pair-in-javascript\/#more-228838\">Read more<span class=\"screen-reader-text\">How to loop through key-value pair in JavaScript?<\/span><\/a><\/p>\n","protected":false},"author":57,"featured_media":107420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86279],"tags":[],"class_list":["post-228838","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 loop through key-value pair in JavaScript?<\/title>\n<meta name=\"description\" content=\"When working with objects in JavaScript, it is often necessary to loop through the key-value pairs of an object. 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