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array

how to write array type​

// infer
// typescript infers that here is a string type.
let stringArr = ["one", "two"];

// typescript infers that here is a (number | string) union type.
let numStrArr = [123, "one"];

// typescript infers that here is a any type.
let arr = [];
let bands: string[] = ["little big town"];

let mixedArr: (string | boolean | number)[] = ["nansen", 23, true];

If you want to be more strict and define something that is locked in to a type in a specific element position and a specific length of an array. You can create a Tuple.