Mapped Types - TypeScript Tutorial
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When you don’t want to repeat yourself, sometimes a type needs to be based on another type.
Mapped types build on the syntax for index signatures, which are used to declare the types of properties which has not been declared ahead of time:
type OnlyBoolsAndHorses = {
[key: string]: boolean | Horse;
};
const conforms: OnlyBoolsAndHorses = {
del: true,
rodney: false,
};
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TypeScript lets you write JavaScript the way you really want to. TypeScript is a typed superset of JavaScript that compiles to plain JavaScript. TypeScript is pure object oriented with classes, interfaces and statically typed like C# or Java. The popular JavaScript framework Angular 2.0 is written in TypeScript.
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