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compact ​

Problem ​

You have an array that may contain null, undefined, 0, false, or '' and need to drop all falsy values in one pass.

Solution ​

Use compact(array) to return a new array with all falsy values removed.

ts
import { compact } from '@vielzeug/arsenal';

compact([0, 1, false, 2, '', 3, null, undefined]);
// [1, 2, 3]

With typed arrays ​

ts
import { compact } from '@vielzeug/arsenal';

const ids: (number | null)[] = [1, null, 2, null, 3];
const validIds: number[] = compact(ids);
// [1, 2, 3]

Pitfalls ​

  • 0, false, and '' are removed. Use filterMap if you need to keep some falsy values.
  • Returns a new array; the original is not mutated.