--- title: The Basics of JavaScript | daily.dev description: A beginner-level primer on JavaScript fundamentals covering what JavaScript is, how it's added to HTML pages, variable declaration keywords (var, let, const),... canonical: https://daily.dev/posts/the-basics-of-javascript-vp6w47za7 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: The Basics of JavaScript | daily.dev og:description: A beginner-level primer on JavaScript fundamentals covering what JavaScript is, how it's added to HTML pages, variable declaration keywords (var, let, const),... og:url: https://daily.dev/posts/the-basics-of-javascript-vp6w47za7 og:image: https://api.daily.dev/og/posts/vP6w47za7.png og:image:alt: The Basics of JavaScript og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # The Basics of JavaScript **[Medium](https://daily.dev/sources/medium_js)** · 3 min read · 2 upvotes · 0 comments ## Summary A beginner-level primer on JavaScript fundamentals covering what JavaScript is, how it's added to HTML pages, variable declaration keywords (var, let, const), scope types (global, functional, block), hoisting, and primitive versus non-primitive data types like strings, numbers, booleans, objects, and arrays. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Medium](https://daily.dev/posts/medium-1u0d8vipk) · Medium · 1 upvotes · 0 comments - [Dynamic Data: A Beginner’s Guide to JavaScript Data Type](https://daily.dev/posts/dynamic-data-a-beginner-s-guide-to-javascript-data-type-zy1zgrsrx) · Medium · 3 upvotes · 0 comments --- Tags: [#webdev](https://daily.dev/tags/webdev), [#javascript](https://daily.dev/tags/javascript) [View this post on daily.dev](https://daily.dev/posts/the-basics-of-javascript-vp6w47za7) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"The Basics of JavaScript","url":"https://daily.dev/posts/the-basics-of-javascript-vp6w47za7","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/the-basics-of-javascript-vp6w47za7"},"datePublished":"2026-08-24T15:49:58.043Z","dateModified":"2026-09-14T09:33:39.375Z","description":"A beginner-level primer on JavaScript fundamentals covering what JavaScript is, how it's added to HTML pages, variable declaration keywords (var, let, const),...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/05ff7a86224f35ceab9a40b7b5a5a44d?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/05ff7a86224f35ceab9a40b7b5a5a44d?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Medium","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Medium","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/medium","url":"https://daily.dev/sources/medium_js"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/the-basics-of-javascript-vp6w47za7","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":2},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"webdev,javascript","timeRequired":"PT3M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Medium","item":"https://daily.dev/sources/medium_js"},{"@type":"ListItem","position":3,"name":"The Basics of JavaScript"}]} ```