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When I declare a function as
const coordinates = (id: number): ([number, number]) => {
the error I get is [ts] Duplicate identifier 'number'.
If I omit type signature for return value, then it infers it as number[]
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Strictly speaking, a function can only return one value, but if the value is a tuple, the effect is the same as returning multiple values. For example, if you want to divide two integers and compute the quotient and remainder, it is inefficient to compute x//y and then x%y .
A Python function can return any object such as a tuple. To return a tuple, first create the tuple object within the function body, assign it to a variable your_tuple , and return it to the caller of the function using the keyword operation “ return your_tuple “.
A tuple is a TypeScript type that works like an array with some special considerations: The number of elements of the array is fixed. The type of the elements is known. The type of the elements of the array need not be the same.
const coordinates = (id: number): [number, number] => [id, id];
No need for the parenthesis around the return tuple type
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const coordinates = (id: number) => [id, id] as const;
// const coordinates: (id: number) => [number, number]
From TypeScript 3.4 onwards you can use const assertations.
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