Defining array with multiple types in TypeScript

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Defining array with multiple types in TypeScript

Use a union type (string|number)[] demo:

const foo: (string|number)[] = [ 1, "message" ];

I have an array of the form: [ 1, “message” ].

If you are sure that there are always only two elements [number, string] then you can declare it as a tuple:

const foo: [number, string] = [ 1, "message" ];

IMPORTANT NOTE

This won’t work with complex types with different properties, when you want to access a property available on only one of the types.

See this newer answer.

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