Typescript Mini Reference 2023: A Quick Guide to Typescript Programming Language by Harry Yoon

Author:Harry Yoon
Language: eng
Format: epub
Published: 2023-04-25T05:00:00+00:00

①

The type annotation is not needed. string[] is the same as Array<string>.

②

The type annotation is necessary since the type of the initial value is ambiguous. Array<number> is the same as number[].

For heterogeneous arrays, that is, for the arrays with different type items, we can use the narrowest type that is compatible with all the item types. Or, in an extreme case, we can use an array of any or unknown. For instance,

const mix: any[] = ["one", 2, "three"]; ①

①

The inferred type in this case would be (string | number)[].

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