Arrays and tuples

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Arrays and tuples#

Homogeneous array.

const xs: number[] = [1, 2, 3];

Generic-style spelling; identical.

const ys: Array<number> = [1, 2, 3];

Read-only array (no mutator methods).

const rs: readonly number[] = [1, 2, 3];

Fixed-length tuple.

const pair: [string, number] = ["rk", 30];

Labelled tuple positions.

const labelled: [name: string, age: number] = ["rk", 30];

Variadic tuple (head plus rest).

const variadic: [string, ...number[]] = ["x", 1, 2];

A tuple gives positional names and a fixed length; an array is homogeneous and variable-length.

References#

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