API reference › @evolu/common › Array › arrayFrom

Call Signature

function arrayFrom<T>(iterable: Iterable<T>): readonly T[];

Defined in: packages/common/src/Array.ts:180

Better Array.from.

  • Returns readonly arrays
  • Accepts length directly: arrayFrom(3, fn) instead of Array.from({ length: 3 }, fn)
  • Skips copying if iterable is already an array (safe because readonly)

Example

arrayFrom(new Set([1, 2, 3])); // ReadonlyArray<number>
arrayFrom(3, (i) => i * 10); // [0, 10, 20]
arrayFrom(iterableMaybeArray); // no unnecessary copy

Unlike Array.from, there's no map parameter for iterables — use mapArray instead, or iterator helpers directly on iterables.

Call Signature

function arrayFrom<T>(length: number, map: (index: number) => T): readonly T[];

Defined in: packages/common/src/Array.ts:182

From length and map function.

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