TypeScript Union Types All In One

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// 联合类型 Union Types
let mix: number | string | boolean;
// let mix: string | number | boolean
mix = 1;
mix.toFixed();
mix = 'a';
mix.endsWith('x');
mix = false;
mix.valueOf();


let arr: number[] | string[] | (number | string)[];
arr = [1, 2, 3];
arr = ['a', 'b', 'c'];
arr = [1, 'b', 3];

refs

https://www.typescriptlang.org/docs/handbook/unions-and-intersections.html#union-types

https://www.typescriptlang.org/docs/handbook/advanced-types.html#using-the-in-operator

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