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Updating the line length to 80
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filename: learntypescript.ts
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---
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TypeScript is a language that aims at easing development of large scale applications written in JavaScript.
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TypeScript adds common concepts such as classes, modules, interfaces, generics and (optional) static typing to JavaScript.
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It is a superset of JavaScript: all JavaScript code is valid TypeScript code so it can be added seamlessly to any project. The TypeScript compiler emits JavaScript.
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TypeScript is a language that aims at easing development of large scale
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applications written in JavaScript. TypeScript adds common concepts such as
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classes, modules, interfaces, generics and (optional) static typing to
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JavaScript. It is a superset of JavaScript: all JavaScript code is valid
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TypeScript code so it can be added seamlessly to any project. The TypeScript
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compiler emits JavaScript.
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This article will focus only on TypeScript extra syntax, as opposed to [JavaScript](/docs/javascript).
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This article will focus only on TypeScript extra syntax, as opposed to
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[JavaScript](/docs/javascript).
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To test TypeScript's compiler, head to the [Playground] (http://www.typescriptlang.org/Playground) where you will be able to type code, have auto completion and directly see the emitted JavaScript.
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To test TypeScript's compiler, head to the
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[Playground] (http://www.typescriptlang.org/Playground) where you will be able
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to type code, have auto completion and directly see the emitted JavaScript.
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```ts
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// There are 3 basic types in TypeScript
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@ -19,7 +25,8 @@ let isDone: boolean = false;
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let lines: number = 42;
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let name: string = "Anders";
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// But you can omit the type annotation if the variables are derived from explicit literals
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// But you can omit the type annotation if the variables are derived
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// from explicit literals
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let isDone = false;
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let lines = 42;
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let name = "Anders";
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