{"id":5150,"date":"2026-03-30T13:52:33","date_gmt":"2026-03-30T08:22:33","guid":{"rendered":"https:\/\/codematrix.co.in\/blog\/?page_id=5150"},"modified":"2026-03-31T10:18:09","modified_gmt":"2026-03-31T04:48:09","slug":"variables-and-datatypes-in-javascript","status":"publish","type":"page","link":"https:\/\/codematrix.co.in\/blog\/variables-and-datatypes-in-javascript\/","title":{"rendered":"Variables and Datatypes in JavaScript"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"5150\" class=\"elementor elementor-5150\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f5cc0ac e-flex e-con-boxed e-con e-parent\" data-id=\"f5cc0ac\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-14ae28e elementor-widget elementor-widget-html\" data-id=\"14ae28e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<style>\r\n    \/* --- Brand Styling --- *\/\r\n    :root {\r\n        --brand-purple: #9C00E4;\r\n        --brand-light: #f3e8ff;\r\n    }\r\n\r\n    \/* Reset & Base *\/\r\n    .python-full-layout * { box-sizing: border-box; }\r\n\r\n    \/* Layout Adjustments *\/\r\n    .python-full-layout { \r\n        display: flex; \r\n        gap: 30px; \r\n        padding: 20px; \r\n        max-width: 1200px; \r\n        margin: 0 auto;\r\n        background: #fdfbff; \r\n    }\r\n\r\n    .sidebar { \r\n        width: 280px; \r\n        position: sticky; \r\n        top: 20px; \r\n        height: fit-content; \r\n        flex-shrink: 0;\r\n    }\r\n\r\n    .sidebar .topic { \r\n        display: block; \r\n        padding: 12px; \r\n        text-decoration: none; \r\n        color: #444; \r\n        border-radius: 8px; \r\n        margin-bottom: 8px; \r\n        background: #fff;\r\n        border: 1px solid #eee;\r\n        transition: 0.3s;\r\n    }\r\n\r\n    .sidebar .topic.active { \r\n        background: var(--brand-purple); \r\n        color: white; \r\n        border-color: var(--brand-purple);\r\n    }\r\n\r\n    \/* Main Content *\/\r\n    .main-content { \r\n        flex: 1; \r\n        font-family: 'Segoe UI', sans-serif; \r\n        min-width: 0; \r\n    }\r\n\r\n    .article-card { \r\n        background: white; \r\n        padding: 30px; \r\n        border-radius: 15px; \r\n        box-shadow: 0 4px 15px rgba(0,0,0,0.05); \r\n    }\r\n\r\n    h1 { color: var(--brand-purple); font-size: 2.2rem; margin-bottom: 20px; }\r\n    h2 { color: #333; margin-top: 30px; border-left: 4px solid var(--brand-purple); padding-left: 15px; }\r\n    \r\n    .custom-img { \r\n        display: block; \r\n        margin: 30px auto; \r\n        width: 100%; \r\n        max-width: 600px; \r\n        border: 2px solid #e9d5ff; \r\n        border-radius: 10px;\r\n    }\r\n\r\n    code { \r\n        background: #f4f4f4; \r\n        padding: 2px 6px; \r\n        border-radius: 4px; \r\n        font-family: 'Courier New', monospace; \r\n        color: #d63384;\r\n    }\r\n\r\n    pre { \r\n        background: #2d2d2d; \r\n        color: #ccc; \r\n        padding: 15px; \r\n        border-radius: 8px; \r\n        overflow-x: auto; \r\n    }\r\n\r\n    table { \r\n        width: 100%; \r\n        border-collapse: collapse; \r\n        margin: 20px 0; \r\n    }\r\n\r\n    table th, table td { \r\n        border: 1px solid #eee; \r\n        padding: 12px; \r\n        text-align: left; \r\n    }\r\n\r\n    table th { background: #f8f9fa; color: var(--brand-purple); }\r\n\r\n    \/* Responsive *\/\r\n    @media (max-width: 991px) {\r\n        .python-full-layout { flex-direction: column; }\r\n        .sidebar { width: 100%; position: relative; top: 0; }\r\n    }\r\n<\/style>\r\n\r\n<div class=\"python-full-layout\">\r\n    <aside class=\"sidebar\">\r\n        <h2 style=\"font-size: 1.2rem; color: var(--brand-purple); margin-bottom: 15px;\">JS Basics<\/h2>\r\n        <a href=\"#variables\" class=\"topic active\">1. JS Variables<\/a>\r\n        <a href=\"#vardiff\" class=\"topic\">2. var vs let vs const<\/a>\r\n        <a href=\"#datatypes\" class=\"topic\">3. Data Types<\/a>\r\n        <a href=\"#objects\" class=\"topic\">4. Objects & Arrays<\/a>\r\n        <a href=\"#mcq\" class=\"topic\">Practice MCQs<\/a>\r\n    <\/aside>\r\n\r\n    <main class=\"main-content\">\r\n        <article class=\"article-card\">\r\n            \r\n            <header id=\"variables\">\r\n                <h1>Variables and Data Types in JS<\/h1>\r\n                <p>In JavaScript, <strong>Variables<\/strong> are containers for storing data values. Think of them as labeled boxes where you can put information to use later in your program.<\/p>\r\n            <\/header>\r\n\r\n            <img decoding=\"async\" src=\"https:\/\/codematrix.co.in\/blog\/wp-content\/uploads\/2026\/03\/1_IaQAFritIFDnO7IN_yEBEA.jpg\" alt=\"Variables and Datatypes in JavaScript\" class=\"custom-img\">\r\n            \r\n\r\n            <section id=\"vardiff\">\r\n                <h2>1. var, let, and const<\/h2>\r\n                <p>Modern JavaScript uses three keywords to declare variables, each with different rules:<\/p>\r\n                <table>\r\n                    <thead>\r\n                        <tr>\r\n                            <th>Keyword<\/th>\r\n                            <th>Scope<\/th>\r\n                            <th>Can Reassign?<\/th>\r\n                            <th>Description<\/th>\r\n                        <\/tr>\r\n                    <\/thead>\r\n                    <tbody>\r\n                        <tr><td><code>var<\/code><\/td><td>Function<\/td><td>Yes<\/td><td>Old way (avoid using now).<\/td><\/tr>\r\n                        <tr><td><code>let<\/code><\/td><td>Block<\/td><td>Yes<\/td><td>Modern way for values that change.<\/td><\/tr>\r\n                        <tr><td><code>const<\/code><\/td><td>Block<\/td><td>No<\/td><td>For values that stay the same.<\/td><\/tr>\r\n                    <\/tbody>\r\n                <\/table>\r\n            <\/section>\r\n\r\n            <section id=\"datatypes\">\r\n                <h2>2. Primitive Data Types<\/h2>\r\n                <p>JavaScript has several basic types of data:<\/p>\r\n                <ul>\r\n                    <li><strong>String:<\/strong> Text like <code>\"Hello World\"<\/code>.<\/li>\r\n                    <li><strong>Number:<\/strong> Integers or decimals like <code>25<\/code> or <code>3.14<\/code>.<\/li>\r\n                    <li><strong>Boolean:<\/strong> Logical values: <code>true<\/code> or <code>false<\/code>.<\/li>\r\n                    <li><strong>Undefined:<\/strong> A variable that has been declared but not assigned a value.<\/li>\r\n                    <li><strong>Null:<\/strong> Represents an intentional \"empty\" value.<\/li>\r\n                <\/ul>\r\n            <\/section>\r\n\r\n            \r\n            \r\n\r\n            <section id=\"objects\">\r\n                <h2>3. Non-Primitive: Objects & Arrays<\/h2>\r\n                <p>While primitives hold single values, <strong>Objects<\/strong> and <strong>Arrays<\/strong> can hold collections of data.<\/p>\r\n                <pre><code>\/\/ An Array (List)\r\nlet colors = [\"purple\", \"white\", \"black\"];\r\n\r\n\/\/ An Object (Key-Value pairs)\r\nlet student = {\r\n    name: \"Alex\",\r\n    age: 21,\r\n    isCoding: true\r\n};<\/code><\/pre>\r\n            <\/section>\r\n\r\n            <section id=\"mcq\" class=\"practice-mcqs\">\r\n                <h2>Knowledge Check<\/h2>\r\n                <div class=\"mcq-box\" style=\"background: #f9f4ff; padding: 20px; border-radius: 10px; border: 1px solid #e9d5ff;\">\r\n                    <p><strong>1. Which keyword should you use for a variable that will never change?<\/strong><br>\r\n                    A) let | B) var | C) <strong>const<\/strong><\/p>\r\n                    \r\n                    <p><strong>2. What is the data type of the value \"123\"?<\/strong><br>\r\n                    A) Number | B) <strong>String<\/strong> | C) Boolean<\/p>\r\n\r\n                    <p><strong>3. Which of these represents an empty value intentionally?<\/strong><br>\r\n                    A) Undefined | B) <strong>Null<\/strong> | C) Zero<\/p>\r\n                <\/div>\r\n            <\/section>\r\n\r\n            <div style=\"text-align: center; margin-top: 40px;\">\r\n                <a href=\"https:\/\/codematrix.co.in\/courses\" target=\"_blank\" style=\"background: var(--brand-purple); color: white; padding: 12px 25px; text-decoration: none; border-radius: 8px; display: inline-block; font-weight: bold;\">\r\n                    \ud83d\ude80 Start Coding in JavaScript!\r\n                <\/a>\r\n            <\/div>\r\n\r\n        <\/article>\r\n    <\/main>\r\n<\/div>\r\n\r\n<script>\r\nwindow.addEventListener('DOMContentLoaded', () => {\r\n    const sections = document.querySelectorAll('header[id], section[id]');\r\n    const navLinks = document.querySelectorAll('.sidebar .topic');\r\n\r\n    const observer = new IntersectionObserver((entries) => {\r\n        entries.forEach(entry => {\r\n            if (entry.isIntersecting) {\r\n                navLinks.forEach(link => {\r\n                    link.classList.remove('active');\r\n                    if (link.getAttribute('href') === `#${entry.target.id}`) {\r\n                        link.classList.add('active');\r\n                    }\r\n                });\r\n            }\r\n        });\r\n    }, { threshold: 0.5 });\r\n    sections.forEach(section => observer.observe(section));\r\n});\r\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>JS Basics 1. JS Variables 2. var vs let vs const 3. Data Types 4. Objects &#038; Arrays Practice MCQs Variables and Data Types in JS In JavaScript, Variables are containers for storing data values. Think of them as labeled boxes where you can put information to use later in your program. 1. var, let, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"no-sidebar","site-content-layout":"","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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