[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"academy-blogs-en-1-1-all-what-is-typescript-vs-javascript-all--*":3,"academy-blog-faqs-owwjmfb0lon27z3-en":91,"academy-blog-translations-owwjmfb0lon27z3":116},{"data":4,"page":90,"perPage":90,"totalItems":90,"totalPages":90},[5],{"alt":6,"collectionId":7,"collectionName":8,"content":9,"cover_image":10,"cover_image_l_url":11,"cover_image_m_url":12,"cover_image_path":13,"cover_image_s_url":14,"created":15,"created_by":16,"expand":17,"id":83,"keywords":84,"locale":53,"published_at":85,"scheduled_at":70,"school_blog":79,"short_description":86,"status":77,"title":87,"updated":88,"updated_by":89,"slug":80,"views":82},"Hands holding a blue square wooden block at a shape-sorter box on a wooden table, next to triangle and round blocks that won't fit the same hole, with a JavaScript vs TypeScript comparison: errors found at runtime vs before runtime, and file extension .js vs .ts","sclblg987654321","school_blog_translations","\u003Cp>A few months into JavaScript, most students feel pulled two ways. Every job post they open mentions TypeScript, yet their JavaScript still feels too shaky to take on something new. Which pull should win depends on how comfortable you are with JavaScript right now, because TypeScript is not a new language you start from zero. It is JavaScript with an extra reviewer looking over your shoulder.\u003C\u002Fp>\u003Cp>The easiest way to see what that reviewer does is to watch it catch a real bug. Today Superdev Academy walks through one small bug that JavaScript happily runs and TypeScript catches before anything runs, then gives a straight answer on when a beginner should start TypeScript, and what it does not protect you from.\u003C\u002Fp>\u003Ch2>A small bug JavaScript lets through\u003C\u002Fh2>\u003Cp>Imagine a points page. A user has 100 points and types a bonus of 50 into an input field. We write a function to add them up:\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-js\">\u002F\u002F points.js\nfunction addPoints(current, bonus) {\n  return current + bonus;\n}\n\nconst bonus = document.querySelector(\"#bonus\").value; \u002F\u002F \"50\", a string\nconsole.log(addPoints(100, bonus)); \u002F\u002F 10050\n\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>The answer should be 150. What comes out is 10050, because a value read from an input field is always a string. When you add a number to a string, JavaScript does not complain. It quietly glues the two together as text. The program finishes, and not a single error appears.\u003C\u002Fp>\u003Cp>What makes this kind of bug dangerous is how quiet it is. You find out when someone sees a five-digit points balance on screen, and that someone might already be a real user.\u003C\u002Fp>\u003Ch2>TypeScript catches the same bug before it runs\u003C\u002Fh2>\u003Cp>Now write the same function in TypeScript. The only addition is \u003Ccode>: number\u003C\u002Fcode> in two places, telling TypeScript that both parameters must be numbers.\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-ts\">\u002F\u002F points.ts\nfunction addPoints(current: number, bonus: number): number {\n  return current + bonus;\n}\n\nconst bonus = \"50\";\naddPoints(100, bonus);\n\u002F\u002F Error: Argument of type 'string' is not assignable to parameter of type 'number'.\n\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>The last line is flagged immediately, before you have even opened a browser. In VS Code you see a red underline under \u003Ccode>bonus\u003C\u002Fcode> as you type (if your editor is not set up yet, see \u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.superdevacademy.com\u002Fen\u002Fblogs\u002Fvs-code-popular-editor-developers\">VS Code: The Most Popular Editor for Developers and Why You Should Use It\u003C\u002Fa>). The fix is simple: convert the value to a number first, for example \u003Ccode>addPoints(100, Number(bonus))\u003C\u002Fcode>.\u003C\u002Fp>\u003Cblockquote>\u003Cp>Put simply: JavaScript finds this bug at runtime. TypeScript finds it before runtime. Every other difference between the two starts here.\u003C\u002Fp>\u003C\u002Fblockquote>\u003Ch2>So what is TypeScript, exactly?\u003C\u002Fh2>\u003Cp>The official TypeScript website describes it in one line: \"JavaScript with syntax for types.\" TypeScript is developed by Microsoft and is open source. Almost any valid JavaScript can go straight into a TypeScript file, and you add types gradually from there.\u003C\u002Fp>\u003Cp>At its core is type checking, and it is static: TypeScript reads your code without running it. The tool that does this is \u003Ccode>tsc\u003C\u002Fcode>, the TypeScript compiler, and it does two jobs at once:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp>\u003Cstrong>Checks types:\u003C\u002Fstrong> finds places where the wrong kind of data is used and reports an error.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>\u003Cstrong>Compiles to JavaScript:\u003C\u002Fstrong> strips out every type annotation and outputs a plain \u003Ccode>.js\u003C\u002Fcode> file.\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>The second job matters more than most beginners realise. Browsers cannot run TypeScript directly, so what actually runs on a user's machine is the JavaScript that comes out the other end. The official TypeScript Handbook says it plainly: \u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.typescriptlang.org\u002Fdocs\u002Fhandbook\u002F2\u002Fbasic-types.html\">type annotations never change the runtime behavior of your program\u003C\u002Fa>. Keep that sentence in mind, because it comes back in the limitations section below.\u003C\u002Fp>\u003Ch2>TypeScript vs JavaScript at a glance\u003C\u002Fh2>\u003Ctable style=\"min-width: 75px;\">\u003Ccolgroup>\u003Ccol style=\"min-width: 25px;\">\u003Ccol style=\"min-width: 25px;\">\u003Ccol style=\"min-width: 25px;\">\u003C\u002Fcolgroup>\u003Ctbody>\u003Ctr>\u003Cth colspan=\"1\" rowspan=\"1\">\u003Cp>What we compare\u003C\u002Fp>\u003C\u002Fth>\u003Cth colspan=\"1\" rowspan=\"1\">\u003Cp>JavaScript\u003C\u002Fp>\u003C\u002Fth>\u003Cth colspan=\"1\" rowspan=\"1\">\u003Cp>TypeScript\u003C\u002Fp>\u003C\u002Fth>\u003C\u002Ftr>\u003Ctr>\u003Ctd colspan=\"1\" rowspan=\"1\">\u003Cp>When type errors are found\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd colspan=\"1\" rowspan=\"1\">\u003Cp>At runtime\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd colspan=\"1\" rowspan=\"1\">\u003Cp>Before runtime\u003C\u002Fp>\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd colspan=\"1\" rowspan=\"1\">\u003Cp>File extension\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd colspan=\"1\" rowspan=\"1\">\u003Cp>.js\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd colspan=\"1\" rowspan=\"1\">\u003Cp>.ts\u003C\u002Fp>\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd colspan=\"1\" rowspan=\"1\">\u003Cp>Needs compiling first?\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd colspan=\"1\" rowspan=\"1\">\u003Cp>No\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd colspan=\"1\" rowspan=\"1\">\u003Cp>Yes, to run in a browser (Node.js from 22.18\u002F23.6 runs .ts files directly for erasable type syntax only, Deno and Bun run them directly too, but none of them type-check by default)\u003C\u002Fp>\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd colspan=\"1\" rowspan=\"1\">\u003Cp>Type annotations\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd colspan=\"1\" rowspan=\"1\">\u003Cp>None\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd colspan=\"1\" rowspan=\"1\">\u003Cp>Yes, e.g. \u003Ccode>: number\u003C\u002Fcode>\u003C\u002Fp>\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd colspan=\"1\" rowspan=\"1\">\u003Cp>What the browser runs\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd colspan=\"1\" rowspan=\"1\">\u003Cp>The .js file\u003C\u002Fp>\u003C\u002Ftd>\u003Ctd colspan=\"1\" rowspan=\"1\">\u003Cp>The compiled .js file\u003C\u002Fp>\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftbody>\u003C\u002Ftable>\u003Cp>If you have read about how \u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.superdevacademy.com\u002Fen\u002Fblogs\u002Fhistory-of-javascript-from-10-days-to-global-standard\">JavaScript was created in 10 days\u003C\u002Fa>, it is easier to see why JavaScript is so relaxed about data types. It was designed for short scripts on web pages, not for teams of dozens maintaining hundreds of thousands of lines. TypeScript fills that gap without changing the language that actually runs.\u003C\u002Fp>\u003Ch2>Why TypeScript seems to be everywhere lately\u003C\u002Fh2>\u003Cp>It is not just a feeling. Two primary sources back it up:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp>\u003Cstrong>GitHub Octoverse 2025\u003C\u002Fstrong> (published 28 October 2025) reported that \u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fgithub.blog\u002Fnews-insights\u002Foctoverse\u002Foctoverse-a-new-developer-joins-github-every-second-as-ai-leads-typescript-to-1\u002F\">August 2025 was the first time TypeScript became the most used language on GitHub\u003C\u002Fa> by contributor count, passing Python by roughly 42,000 contributors.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>\u003Cstrong>The Stack Overflow Developer Survey 2025\u003C\u002Fstrong> found that \u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fsurvey.stackoverflow.co\u002F2025\u002Ftechnology\">43.6% of all respondents worked with TypeScript in the past year\u003C\u002Fa> (JavaScript sits at 66%). Among professional developers the TypeScript figure rises to 48.8%, while among people learning to code it is 31.9%.\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>Both sources are global. Neither measures developers in any single country, so they show the direction of the industry rather than the share of any one local job market. What the numbers do show is a fairly wide gap between learners (31.9%) and working developers (48.8%), which suggests many people first meet TypeScript at their first job, not while studying.\u003C\u002Fp>\u003Cp>One more recent change: TypeScript 7.0 shipped as a stable release on 8 July 2026. The TypeScript team rewrote the compiler as a native port in Go and \u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fdevblogs.microsoft.com\u002Ftypescript\u002Fannouncing-typescript-7-0\u002F\">reported full builds running roughly 8 to 12 times faster\u003C\u002Fa>. The command is still \u003Ccode>tsc\u003C\u002Fcode>. For a beginner this barely changes how you write code, but it is a signal that the tool is still being invested in heavily.\u003C\u002Fp>\u003Ch2>TypeScript is not free, and it does not stop every bug\u003C\u002Fh2>\u003Cp>By now TypeScript may sound like it has no downside. It has two real costs worth knowing before you decide.\u003C\u002Fp>\u003Cp>\u003Cstrong>Setup and learning cost.\u003C\u002Fstrong> A .js file opens in the browser as it is. A .ts file needs TypeScript installed with \u003Ccode>npm install -D typescript\u003C\u002Fcode>, a \u003Ccode>tsconfig.json\u003C\u002Fcode> config file, and an extra compile step. On top of that, some error messages run several lines long and are hard for a beginner to read. If you are still unsure how variables and functions work, adding a layer of type errors can wear you down faster than it should.\u003C\u002Fp>\u003Cp>\u003Cstrong>The bigger one: types do not check data at runtime.\u003C\u002Fstrong> Remember the Handbook line above? Types are erased at compile time. Once the program is running, nothing checks types anymore. The most common place this bites is data from an API:\u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-ts\">interface User {\n  name: string;\n  age: number;\n}\n\nconst res = await fetch(\"\u002Fapi\u002Fuser\");\nconst user: User = await res.json();\nconsole.log(user.age + 1); \u002F\u002F if the API sends age as \"20\", this prints \"201\"\n\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>This code passes type checking without a complaint, because we told TypeScript \"trust me, this is a \u003Ccode>User\u003C\u002Fcode>.\" But if the server sends \u003Ccode>age\u003C\u002Fcode> as a string, the exact bug from the start of this article is back, and this time TypeScript cannot see it at all. (If sending and receiving data through an API is still new to you, start with \u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.superdevacademy.com\u002Fen\u002Fblogs\u002Fwhat-is-api-beginners-guide\">What is an API?\u003C\u002Fa>)\u003C\u002Fp>\u003Cp>So data that comes from outside your program, whether from an API, an input field or a file, still has to be checked at runtime, for example with \u003Ccode>typeof user.age === \"number\"\u003C\u002Fcode> before you do any maths with it. TypeScript keeps the code inside your program consistent with itself. It cannot make the outside world send you what you expect.\u003C\u002Fp>\u003Ch2>When should a beginner start TypeScript?\u003C\u002Fh2>\u003Cp>The straight answer: after you can write basic JavaScript, not before, and without waiting until you feel like an expert.\u003C\u002Fp>\u003Cp>The reason is that everything TypeScript checks is JavaScript. If you do not yet understand how a string differs from a number, or what an object looks like, TypeScript errors are just noise, not help.\u003C\u002Fp>\u003Cp>Signs you are ready to move to TypeScript:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp>You can write functions and use arrays and objects without looking up an example every time.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>You have used \u003Ccode>fetch\u003C\u002Fcode> and handled \u003Ccode>async\u002Fawait\u003C\u002Fcode> in at least one project.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>You keep running into \"wrong kind of value\" bugs, or \u003Ccode>undefined\u003C\u002Fcode> showing up from nowhere.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>You are about to start a React project, or your workplace code is already in .ts files.\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>The lightest way to start is to take a small JavaScript project you already have, rename one file from .js to .ts, and add types to the function parameters first. Seeing what TypeScript flags in code you wrote yourself teaches more than a whole chapter of theory.\u003C\u002Fp>\u003Cp>The \u003Ccode>interface\u003C\u002Fcode> keyword in the API example above is simply a way to name the shape of an object so you can reuse it. A React project written in TypeScript works on the same idea: files become .tsx and types describe each component's props. If the points bug at the start made sense to you, you already understand why both exist.\u003C\u002Fp>\u003Cp>If you are still deciding which language to learn first, it helps to hear how others chose theirs and whether they would choose the same again: \u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.superdevacademy.com\u002Fen\u002Fblogs\u002Ffirst-programming-language-choice\">What Was Your First Programming Language?\u003C\u002Fa>\u003C\u002Fp>\u003Cdiv data-type=\"horizontalRule\">\u003Chr>\u003C\u002Fdiv>\u003Ch2>Summary: what TypeScript is, and when to start\u003C\u002Fh2>\u003Cp>TypeScript is JavaScript with types added. Its checker, \u003Ccode>tsc\u003C\u002Fcode>, looks for data-type bugs before your code runs, then compiles everything down to plain JavaScript for the browser. The key difference fits in one line: JavaScript finds a bug like 100 + \"50\" at runtime, TypeScript finds it before runtime. The price is extra setup, and one thing to always remember: types do not check data coming from an API at runtime.\u003C\u002Fp>\u003Cp>If basic JavaScript still feels shaky, there is no rush. Build that foundation first. If you can already write functions and fetch data, rename your first file to .ts this week and see what TypeScript finds in your code.\u003C\u002Fp>\u003Cp>Follow more articles and tips for people starting out as programmers on our channels.\u003C\u002Fp>\u003Cp>Facebook: \u003Cstrong>Superdev School (Superdev)\u003C\u002Fstrong> — \u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.facebook.com\u002Fsuperdev.school.th\">https:\u002F\u002Fwww.facebook.com\u002Fsuperdev.school.th\u003C\u002Fa>\u003C\u002Fp>\u003Cp>Instagram: \u003Cstrong>superdevschool\u003C\u002Fstrong> — \u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.instagram.com\u002Fsuperdevschool\u002F\">https:\u002F\u002Fwww.instagram.com\u002Fsuperdevschool\u002F\u003C\u002Fa>\u003C\u002Fp>\u003Cp>TikTok: \u003Cstrong>superdevschool\u003C\u002Fstrong> — \u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.tiktok.com\u002F@superdevschool\">https:\u002F\u002Fwww.tiktok.com\u002F@superdevschool\u003C\u002Fa>\u003C\u002Fp>\u003Cp>Website: \u003Cstrong>www.superdevacademy.com\u003C\u002Fstrong> — \u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.superdevacademy.com\u002F\">https:\u002F\u002Fwww.superdevacademy.com\u002F\u003C\u002Fa>\u003C\u002Fp>","cover_cover_7fcdbq3jv7.webp","https:\u002F\u002Ftwsme-r2.tumwebsme.com\u002Fsclblg987654321\u002F7vcdhqow25f2a3p\u002Fl\u002Fcover_cover_7fcdbq3jv7.webp","https:\u002F\u002Ftwsme-r2.tumwebsme.com\u002Fsclblg987654321\u002F7vcdhqow25f2a3p\u002Fm\u002Fcover_cover_7fcdbq3jv7.webp","https:\u002F\u002Ftwsme-r2.tumwebsme.com\u002Fsclblg987654321\u002F7vcdhqow25f2a3p\u002Fcover_cover_7fcdbq3jv7.webp","https:\u002F\u002Ftwsme-r2.tumwebsme.com\u002Fsclblg987654321\u002F7vcdhqow25f2a3p\u002Fs\u002Fcover_cover_7fcdbq3jv7.webp","2026-09-28 06:52:20.243Z","wfztm6bp9384v3u",{"keywords":18,"locale":47,"school_blog":57},[19,25,29,33,36,40,44],{"collectionId":20,"collectionName":21,"created":22,"created_by":16,"id":23,"name":24,"updated":22,"updated_by":16},"sclkey987654321","school_keywords","2026-09-28 06:52:20.238Z","7ud0nagkqj6dvk6","what is TypeScript",{"collectionId":20,"collectionName":21,"created":26,"created_by":16,"id":27,"name":28,"updated":26,"updated_by":16},"2026-09-28 06:50:30.396Z","fg2rd749fm2lwgs","TypeScript vs JavaScript",{"collectionId":20,"collectionName":21,"created":30,"created_by":16,"id":31,"name":32,"updated":30,"updated_by":16},"2026-09-28 06:52:20.239Z","h6ln9fi0ic9ek3j","difference between TypeScript and JavaScript",{"collectionId":20,"collectionName":21,"created":30,"created_by":16,"id":34,"name":35,"updated":30,"updated_by":16},"2jssrfadkzitouy","should I learn TypeScript",{"collectionId":20,"collectionName":21,"created":37,"created_by":16,"id":38,"name":39,"updated":37,"updated_by":16},"2026-09-28 06:50:30.397Z","a24fve7lrie4zuo","React TypeScript",{"collectionId":20,"collectionName":21,"created":41,"created_by":16,"id":42,"name":43,"updated":41,"updated_by":16},"2026-09-28 06:52:20.240Z","me3li6b99s7yng4","TypeScript interface",{"collectionId":20,"collectionName":21,"created":41,"created_by":16,"id":45,"name":46,"updated":41,"updated_by":16},"qm9y7b7b6j401sb","type checking",{"code":48,"collectionId":49,"collectionName":50,"created":51,"flag":52,"id":53,"is_default":54,"label":55,"updated":56},"en","pbc_1989393366","locales","2026-01-22 11:00:02.726Z","twemoji:flag-united-states","qv9c1llfov2d88z",false,"English","2026-04-10 15:42:46.825Z",{"category":58,"collectionId":59,"collectionName":60,"created":61,"expand":62,"id":79,"slug":80,"updated":81,"views":82},"rfxf19ot4iq992c","pbc_2105096300","school_blogs","2026-09-28 06:50:30.400Z",{"category":63},{"blogIds":64,"collectionId":65,"collectionName":66,"created":67,"created_by":68,"id":58,"image":69,"image_alt":70,"image_path":71,"image_s_url":72,"label":73,"name":74,"priority":75,"publish_at":76,"scheduled_at":70,"status":77,"updated":78,"updated_by":68},[],"sclcatblg987654321","school_category_blogs","2026-03-04 08:32:03.969Z","76qprkevbgfdps8","7acfigk1qkd_lv1k6bkji3_7h89h9h63a.webp","","https:\u002F\u002Ftwsme-r2.tumwebsme.com\u002Fsclcatblg987654321\u002Frfxf19ot4iq992c\u002F7acfigk1qkd_lv1k6bkji3_7h89h9h63a.webp","https:\u002F\u002Ftwsme-r2.tumwebsme.com\u002Fsclcatblg987654321\u002Frfxf19ot4iq992c\u002Fs\u002F7acfigk1qkd_lv1k6bkji3_7h89h9h63a.webp",{"en":74,"th":74},"Web Development",0,"2025-01-21 03:43:00.282Z","published","2026-08-18 14:48:42.218Z","owwjmfb0lon27z3","what-is-typescript-vs-javascript","2026-10-05 10:59:37.699Z",116,"7vcdhqow25f2a3p",[23,27,31,34,38,42,45],"2026-10-05 03:04:39.392Z","What is TypeScript? See one real bug JavaScript lets run and TypeScript catches before running, what types can't check, and when beginners should start.","What Is TypeScript? TypeScript vs JavaScript and When to Start","2026-10-05 03:04:39.394Z","ebkf8ra4nd55ual",1,[92,96,100,104,108,112],{"answer":93,"id":94,"question":95},"TypeScript is a programming language built on top of JavaScript that adds syntax for describing data types. It is developed by Microsoft, and the official site typescriptlang.org describes it as \"JavaScript with syntax for types.\" TypeScript code is compiled with the tsc command into plain .js files, so it is not a separate language from JavaScript. It is JavaScript with a type checker added on top.","3wmgmtuvtxc23sn","What is TypeScript, and is it a separate language from JavaScript?",{"answer":97,"id":98,"question":99},"The main difference is when data-type bugs are found: JavaScript finds them at runtime, TypeScript finds them before runtime. Pass the string \"50\" into a function that expects a number and JavaScript keeps running with a wrong result, while TypeScript reports an error before anything runs. JavaScript files use the .js extension and run as they are, while TypeScript files use .ts and must be compiled to JavaScript first.","kxxjkicxh6zj56z","What is the difference between TypeScript and JavaScript?",{"answer":101,"id":102,"question":103},"No. Beginners should learn basic JavaScript first and move to TypeScript afterwards, because everything TypeScript checks is JavaScript. You are ready when you can write functions, use arrays and objects, and have used fetch with async\u002Fawait in at least one project. The lightest way to start is to rename a single file from .js to .ts and add types to your function parameters.","0j60kkzqh9sssbm","Should I learn TypeScript before JavaScript?",{"answer":105,"id":106,"question":107},"React with TypeScript is a React project written in TypeScript instead of JavaScript. Component files use the .tsx extension instead of .jsx, and types describe the props each component accepts. If you pass a prop of the wrong type or forget a required one, TypeScript reports it before the code runs. React itself behaves exactly the same, because the code is compiled to JavaScript before it reaches the browser.","k45rj1shau54hv9","What is React with TypeScript, and how is it different from plain React?",{"answer":109,"id":110,"question":111},"An interface in TypeScript is a named description of an object's shape that you can reuse. For example, interface User { name: string; age: number } describes an object that must have name as a string and age as a number. If any code uses a User in the wrong shape, TypeScript flags it before runtime. Interfaces are erased at compile time, so they do not check real data arriving from an API at runtime.","87izejewscll029","What is an interface in TypeScript?",{"answer":113,"id":114,"question":115},"As of September 2026, the latest stable version is TypeScript 7.0, released on 8 July 2026. Microsoft's TypeScript team rewrote the compiler as a native port in Go and reported full builds running roughly 8 to 12 times faster. You still install it with npm install -D typescript and run the same tsc command, so for beginners the way you write code barely changes.","6tyb60cvqm9o0ha","What is the latest version of TypeScript, and what changed in TypeScript 7?",{"th":80,"en":80}]