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Typescript Basic Types table
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| Javascript type | constructor | example values | typescript type | example usage | alternative syntax | |
|---|---|---|---|---|---|---|
| Boolean | Boolean(1); | true, false | boolean | const isOpen: boolean = true; | ||
| Number | Number('1'); | 1, 2 | number | const n: number = 1; | ||
| String | String('');, '',", `` | 'ok' | string | const str: string = 'ok'; | ||
| Array | new Array(); []; | [1, 2, 3]; | number[]; Array<number>; | const list: number[] = [1, 2, 3]; | const list: Array<number> = [1, 2, 3]; | |
| Null | null | null | null | const n: null = null; | ||
| Undefined | undefined | undefined | undefined | const u: undefined = undefined; | ||
| Object | new Object(); | {key: 'value'}; | object | const item: object = {key: 'value'}; | const item: {[key: string]: string} = {key: 'value'}; | |
| ['Hello', true]; | Touple | const hi: [string, boolean] = ['Hello', true] | ||||
| enum | enum Color {Red, Green, Blue} | |||||
| any | let x: any = 4; x = ''; x = false; | |||||
| void | function log(): void => {}; | const fn = (): void => {}; | ||||
| never | const error = (): never => { throw new Error(); }; | const fn = (): never => { while (true) {}; }; |
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I could be wrong, but date should also be included here. Thanks for this table tho <3. Re-learning typescript after not using it for 3 years is kinda wonky.