Let myRealRealAge : number | string = 24 myRealRealAge = ' 24 ' // myRealRealAge = true // Not possible since myRealRealAge only accepts a number or a string. Just like JavaScript, TypeScript also uses double quotes (“) or single quotes (‘) to surround string data. As in other languages, we use the type string to refer to these textual datatypes. In TypeScript, we support much the same types as you would expect in JavaScript, with a convenient enumeration type thrown in to help things along.Īnother fundamental part of creating programs in JavaScript for webpages and servers alike is working with textual data. TypeScript is developed by Microsoft and is increasingly supported by the day by technologies such as Angular, Vue.js 3, React.js, and many others.Īs TypeScript code can be compiled to ES5, it includes all of the native JavaScript features such as spread arrow function, deconstructors, and introduces some very useful features such as decorators, generics and interfaces, enums, modules, among others which can be found in different programming languages.įor programs to be useful, we need to be able to work with some of the simplest units of data: numbers, strings, structures, boolean values, and the like. TypeScript is a very powerful addition to JavaScript. Setting up React References (React.createRef() or useRef API).References ( React.createRef() or useRef API).TypeScript while using create-react-app.Omitting specific properties when extending an interface.Extends Keyword (Interface Inheritance).Index Signatures (Dynamic Property Names).Manually declaring a third party library.The cheatsheet contains references to types, classes, decorators, and many other TypeScript related subjects. View on GitHubĪ set of TypeScript related notes used for quick reference. typescript-cheatsheet A set of TypeScript related notes used for quick reference. Typescript-cheatsheet | A set of TypeScript related notes used for quick reference.
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