{"id":2884,"date":"2025-04-07T14:20:02","date_gmt":"2025-04-07T13:20:02","guid":{"rendered":"https:\/\/codeflarelimited.com\/blog\/?p=2884"},"modified":"2025-04-07T14:20:04","modified_gmt":"2025-04-07T13:20:04","slug":"why-returns-false-in-javascript-and-how-to-properly-compare-arrays-objects","status":"publish","type":"post","link":"https:\/\/codeflarelimited.com\/blog\/why-returns-false-in-javascript-and-how-to-properly-compare-arrays-objects\/","title":{"rendered":"Why [] === [] Returns false in JavaScript (And How to Properly Compare Arrays &#038; Objects)"},"content":{"rendered":"\n<p>JavaScript can sometimes behave in unexpected ways, especially when comparing arrays and objects. If you&#8217;ve ever wondered why <code>[] === []<\/code> evaluates to <code>false<\/code>, this guide explains the reason and provides practical solutions for comparing arrays and objects correctly. See <a href=\"https:\/\/codeflarelimited.com\/blog\/optional-chaining-how-to-avoid-cannot-read-property-errors-in-javascript\/\">Optional Chaining (?.): How to Avoid \u2018Cannot Read Property\u2019 Errors in JavaScript<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>1. Why <code>[] === []<\/code> is <code>false<\/code> in JavaScript<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>The Root Cause: Reference vs. Value Comparison<\/strong><\/h3>\n\n\n\n<p>In JavaScript, arrays and objects are <strong>reference types<\/strong>, meaning:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>When you create an array (<code>[]<\/code>) or object (<code>{}<\/code>), JavaScript stores it in memory and returns a <strong>reference<\/strong> (memory address) to it.<\/li>\n\n\n\n<li>The <code>===<\/code> (strict equality) operator checks if two variables point to the <strong>same memory location<\/strong>, not if their contents are identical.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">const arr1 = [];  \nconst arr2 = [];  \n\nconsole.log(arr1 === arr2); \/\/ false (different memory references)  \nconsole.log(arr1 === arr1); \/\/ true (same reference)  <\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>How Primitive Types Differ<\/strong><\/h3>\n\n\n\n<p>Unlike arrays\/objects, <strong>primitives<\/strong> (numbers, strings, booleans, etc.) are compared by <strong>value<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">console.log(5 === 5); \/\/ true  \nconsole.log(\"hello\" === \"hello\"); \/\/ true  <\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>2. How to Compare Arrays &amp; Objects Properly<\/strong><\/h2>\n\n\n\n<p>Since <code>===<\/code> doesn\u2019t work for deep comparisons, here are alternative methods:<\/p>\n\n\n\n<p><a href=\"https:\/\/codeflarelimited.com\/blog\/recursion-for-beginners\/\">See Recursion For Beginners<\/a> <\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A. Comparing Arrays<\/strong><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Method 1: <code>JSON.stringify()<\/code> (Simple, but Limited)<\/strong><\/h4>\n\n\n\n<p>Converts arrays to strings for comparison:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">const arr1 = [1, 2, 3];  \nconst arr2 = [1, 2, 3];  \n\nconsole.log(JSON.stringify(arr1) === JSON.stringify(arr2)); \/\/ true  <\/code><\/pre>\n\n\n\n<p><br>\u26a0 <strong>Limitation:<\/strong> Fails if elements are in different orders or contain <code>undefined<\/code>\/functions.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Method 2: Manual Loop Check (More Reliable)<\/strong><\/h4>\n\n\n\n<p>Compare each element individually:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">function areArraysEqual(arr1, arr2) {  \n  if (arr1.length !== arr2.length) return false;  \n  return arr1.every((item, index) =&gt; item === arr2[index]);  \n}  \n\nconsole.log(areArraysEqual([1, 2], [1, 2])); \/\/ true  \nconsole.log(areArraysEqual([1, 2], [2, 1])); \/\/ false (order matters)  <\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Method 3: Using <code>lodash.isEqual<\/code> (Best for Complex Arrays)<\/strong><\/h4>\n\n\n\n<p>The Lodash library provides deep comparison:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">import _ from 'lodash';  \n\nconsole.log(_.isEqual([1, 2], [1, 2])); \/\/ true  <\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. Comparing Objects<\/strong><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Method 1: <code>JSON.stringify()<\/code> (Works for Simple Objects)<\/strong><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">const obj1 = { name: \"Alice\" };  \nconst obj2 = { name: \"Alice\" };  \n\nconsole.log(JSON.stringify(obj1) === JSON.stringify(obj2)); \/\/ true  <\/code><\/pre>\n\n\n\n<p><br>\u26a0 <strong>Limitation:<\/strong> Fails if properties are in different orders.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Method 2: Manual Key-Value Check<\/strong><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">function areObjectsEqual(obj1, obj2) {  \n  const keys1 = Object.keys(obj1);  \n  const keys2 = Object.keys(obj2);  \n\n  if (keys1.length !== keys2.length) return false;  \n  return keys1.every(key =&gt; obj1[key] === obj2[key]);  \n}  \n\nconsole.log(areObjectsEqual({ a: 1 }, { a: 1 })); \/\/ true  <\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Method 3: Using <code>lodash.isEqual<\/code> (Best for Nested Objects)<\/strong><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">console.log(_.isEqual({ a: 1 }, { a: 1 })); \/\/ true  <\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>3. Key Takeaways<\/strong><\/h2>\n\n\n\n<p>\u2714 <strong><code>[] === []<\/code> is <code>false<\/code><\/strong> because arrays\/objects are compared by <strong>reference<\/strong>, not content.<br>\u2714 <strong>Use <code>JSON.stringify()<\/code><\/strong> for simple comparisons (but be cautious with order\/<code>undefined<\/code>).<br>\u2714 <strong>For deep comparisons<\/strong>, use <code>lodash.isEqual<\/code> or write a custom function.<br>\u2714 <strong>Primitives (<code>5<\/code>, <code>\"hello\"<\/code>)<\/strong> compare by value, so <code>===<\/code> works as expected.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Final Tip: When to Use Each Method<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Case<\/th><th>Best Approach<\/th><\/tr><\/thead><tbody><tr><td>Simple arrays\/objects<\/td><td><code>JSON.stringify()<\/code><\/td><\/tr><tr><td>Order-sensitive arrays<\/td><td>Manual loop check<\/td><\/tr><tr><td>Complex\/nested objects<\/td><td><code>lodash.isEqual()<\/code><\/td><\/tr><tr><td>Performance-critical<\/td><td>Custom comparison function<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Now you know why <code>[] === []<\/code> is <code>false<\/code>\u2014and how to compare arrays &amp; objects properly! \ud83d\ude80<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript can sometimes behave in unexpected ways, especially when comparing arrays and objects. If you&#8217;ve ever wondered why<\/p>\n","protected":false},"author":1,"featured_media":2886,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[98],"tags":[],"class_list":["post-2884","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-softare-development"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why [] === [] Returns false in JavaScript (And How to Properly Compare Arrays &amp; Objects)<\/title>\n<meta name=\"description\" content=\"JavaScript can sometimes behave in unexpected ways, especially when comparing arrays and objects. 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