{"id":2099,"date":"2023-09-14T03:03:51","date_gmt":"2023-09-14T03:03:51","guid":{"rendered":"https:\/\/easycodingschool.com\/?p=2099"},"modified":"2023-09-14T03:51:27","modified_gmt":"2023-09-14T03:51:27","slug":"typescript-fundamental-comparison-rules","status":"publish","type":"post","link":"https:\/\/easycodingschool.com\/blog\/typescript-fundamental-comparison-rules\/","title":{"rendered":"TypeScript Fundamental Comparison Rules"},"content":{"rendered":"<p>Being a superset of JavaScript, TypeScript expands upon its core principles and syntax while incorporating static typing features. Here are some basic criteria for comparing TypeScript to JavaScript:<\/p>\n<ul>\n<li><a href=\"#StaticTyping\">Static Typing<\/a><\/li>\n<li><a href=\"#TypeAnnotations\">Type Annotations<\/a><\/li>\n<li><a href=\"#TypeInference\">Type Inference<\/a><\/li>\n<li><a href=\"#CompiletimeChecking\">Compile-time Checking<\/a><\/li>\n<li><a href=\"#InterfacesandCustomTypes\">Interfaces and Custom Types<\/a><\/li>\n<li><a href=\"#Enum\">Enum<\/a><\/li>\n<li><a href=\"#Classes\">Classes<\/a><\/li>\n<li><a href=\"#ModuleSystem\">Module System<\/a><\/li>\n<li><a href=\"#Tooling\">Tooling<\/a><\/li>\n<li><a href=\"#BackwardCompatibility\">Backward Compatibility<\/a><\/li>\n<\/ul>\n<h3 id=\"StaticTyping\">Static Typing:<\/h3>\n<p><strong>TypeScript:<\/strong> You may specify the data types for variables, function parameters, and return values thanks to TypeScript&#8217;s introduction of static typing. This aids in the compilation-time detection of type-related problems.<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>let age: number = 60;\r\nlet name: string = \"Gk\";<\/code><\/pre>\n<\/div>\n<p><strong>JavaScript:<\/strong> JavaScript is dynamically typed, thus you don&#8217;t need to explicitly specify data types. Runtime type determination might result in runtime errors if handled incorrectly.<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-ts\" data-lang=\"JavaScript\"><code>let age = 30;\r\nlet name = \"GK\";<\/code><\/pre>\n<\/div>\n<h3 id=\"TypeAnnotations\">Type Annotations:<\/h3>\n<p><strong>TypeScript: <\/strong>Letage: number = 30; or function <code>subtract<\/code>(a: number, b: number): number &#8230; are examples of type annotations that can be used to annotate variables, function parameters, and return types.<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>function subtract(a: number, b: number): number {\r\nreturn a - b;\r\n}<\/code><\/pre>\n<\/div>\n<p><strong>JavaScript: <\/strong>Variables and function parameters in JavaScript are declared without explicittype declarations because the language lacks built-in type annotations.<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-ts\" data-lang=\"JavaScript\"><code>function add(a, b) {\r\nreturn a + b;\r\n}<\/code><\/pre>\n<\/div>\n<h3 id=\"TypeInference\">Type Inference:<\/h3>\n<p><strong>TypeScript<\/strong>: If no explicit type annotations are provided, TypeScript can infer the types. If age were set to 30, for instance, it would be obvious that the type was an integer.<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>let age = 30; \/\/ TypeScript infers `age` as `number`<\/code><\/pre>\n<\/div>\n<p><strong>JavaScript: <\/strong>Type inference must be done at runtime because Java Script does not performit.<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>let age = 30; \/\/ Type of `age` is determined at runtime<\/code><\/pre>\n<\/div>\n<h3 id=\"CompiletimeChecking\">Compile-time Checking:<\/h3>\n<p><strong>TypeScript:<\/strong> Type inference must be done at runtime because JavaScript does not perform it.<br \/>\n<strong>JavaScript:<\/strong> Due to type checking performed by JavaScript at runtime, errors may occur and not be discovered until execution.<\/p>\n<h3 id=\"InterfacesandCustomTypes\">Interfaces and Custom Types:<\/h3>\n<p><strong>TypeScript:<\/strong> Using interfaces or the type keyword, TypeScript lets you define your own types. This makes it possible to develop structured contracts for both data and objects.<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>interface Example {\r\nname: string;\r\nage: number;\r\n}\r\n\r\nlet example: Example  = {\r\nname: \"Gk\",\r\nage: 25\r\n};<\/code><\/pre>\n<\/div>\n<p><strong>JavaScript:<\/strong> You must express purpose using object structures, comments, and documentation because JavaScript doesn&#8217;t have native support for constructing custom types.<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-ts\" data-lang=\"JavaScript\"><code>\/\/ In JavaScript, you rely on object structures and documentation\r\nlet example = {\r\nname: \"AV\",\r\nage: 25\r\n};<\/code><\/pre>\n<\/div>\n<h3 id=\"Eunm\">Enum:<\/h3>\n<p><strong>TypeScript:<\/strong> Enums are a technique to define a collection of named constant values and are available in TypeScript.<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>enum ColorGroup {\r\nRed,\r\nGreen,\r\nBlue\r\n}\r\n\r\nlet selectedColor: ColorGroup = ColorGroup.Blue;<\/code><\/pre>\n<\/div>\n<p><strong>JavaScript:<\/strong> Since enums are not natively supported in JavaScript, you often utilize simple objects or constants.<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-ts\" data-lang=\"JavaScript\"><code>\/\/ JavaScript without enums\r\nconst ColorGroup = {\r\nRed: 0,\r\nGreen: 1,\r\nBlue: 2\r\n};\r\n\r\nlet selectedColor = ColorGroup.Green;<\/code><\/pre>\n<\/div>\n<h3 id=\"Classes\">Classes:<\/h3>\n<p><strong>TypeScript:<\/strong> TypeScript supports inheritance and access modifiers like public, private, and protected as well as class-based object-oriented programming.<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>class PersonInfo {\r\nconstructor(public name: string, public age: number) {}\r\n\r\ngreet() {\r\nreturn `Hello, my name is ${this.name} and I'm ${this.age} years old.`;\r\n}\r\n}\r\n\r\nlet personInfo = new PersonInfo(\"Bob\", 30);\r\nconsole.log(personInfo.greet());<\/code><\/pre>\n<\/div>\n<p><strong>JavaScript:<\/strong> Although classes are supported in JavaScript as well (ECMAScript 2015), they are less feature-rich than TypeScript.<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-ts\" data-lang=\"JavaScript\"><code>\/\/ JavaScript class\r\nclass PersonInfo {\r\nconstructor(name, age) {\r\nthis.name = name;\r\nthis.age = age;\r\n}\r\n\r\ngreet() {\r\nreturn `Hello, my name is ${this.name} and I'm ${this.age} years old.`;\r\n}\r\n}\r\n\r\nlet personInfo = new PersonInfo(\"Bob\", 30);\r\nconsole.log(personInfo.greet());<\/code><\/pre>\n<\/div>\n<h3 id=\"ModuleSystem\">Module System:<\/h3>\n<p><strong>TypeScript:<\/strong> TypeScript has built-in support for module declaration and resolution and is compatible with current module systems like CommonJS, ES6 modules, and AMD.<br \/>\n<strong>JavaScript:<\/strong> Modules are supported by JavaScript as well, although the implementation is dependent on the environment (such as Node.js or the browser) and might call for additional tooling.<\/p>\n<h3 id=\"Tooling\">Tooling:<\/h3>\n<p><strong>TypeScript:<\/strong> The TypeScript compiler (tsc) converts TypeScript code into JavaScript. Rich static analysis and code intelligence are provided, and it interfaces effectively with well-known code editors like Visual Studio Code.<br \/>\n<strong>JavaScript:<\/strong> JavaScript relies on runtime error handling and debugging and is directly executed by browsers or Node.js.<\/p>\n<h3 id=\"BackwardCompatibility\">Backward Compatibility:<\/h3>\n<p><strong>TypeScript:<\/strong> To ensure compatibility with vintage browsers and settings, TypeScript code can be transpiled into earlier JavaScript versions.<br \/>\n<strong>JavaScript:<\/strong> The base is JavaScript, and without transpilation or polyfills, newer language capabilities might not be accessible in legacy contexts.<\/p>\n<p><span>You can also discover a lot about\u00a0<\/span><a href=\"https:\/\/easycodingschool.com\/blog\/category\/javascript\/\">Javascript by exploring<span>\u00a0<\/span><\/a><span>different topics.<\/span><\/p>\n<p><strong>Note:<\/strong><span>\u00a0We welcome your feedback at\u00a0<\/span><a href=\"https:\/\/easycodingschool.com\/blog\/\">Easy Coding School<\/a><span>. Please don\u2019t hesitate to share your\u00a0<\/span><a href=\"https:\/\/easycodingschool.com\/blog\/contact\/\" target=\"_blank\" rel=\"noopener\">suggestions<\/a><span>\u00a0or any issues you might have with the article!<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Explore the fundamental differences between TypeScript and JavaScript. Learn how TypeScript&#8217;s static typing, type annotations, and advanced features enhance code reliability and maintainability compared to standard JavaScript.<\/p>\n","protected":false},"author":1,"featured_media":2103,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[87,4,25,175],"tags":[127,108,126,64,24,139,184,182,187,178],"class_list":["post-2099","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-development","category-lifestyle","category-programming","category-typescript","tag-easy-coding","tag-easy-coding-school","tag-easycoding","tag-easycodingschool","tag-programming","tag-programming-courses","tag-typescript","tag-typescript-basic","tag-typescript-fundamental-comparison-rules","tag-typescript-tutorial"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>TypeScript Fundamental Comparison Rules - Easy Coding School<\/title>\n<meta name=\"description\" content=\"Explore the fundamental differences between TypeScript and JavaScript. 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