Note that the typescript function you suggested won't always be accurate if an array has more than one element type. For example:
// string | number last([1, 2, '3']);
If you wanted to make it strictly and absolutely correct, you'd have to make the array readonly and create a function such as this:
const last = <T extends readonly any[]>(arr: T): [undefined, ...T][T['length']] => arr[arr.length - 1];
And when calling it, use the as const cast:
as const
// '3' last([1, 2, '3'] as const);
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Note that the typescript function you suggested won't always be accurate if an array has more than one element type. For example:
If you wanted to make it strictly and absolutely correct, you'd have to make the array readonly and create a function such as this:
And when calling it, use the
as constcast: