API reference › @evolu/common › Types › Predicate

type Predicate<T> = (value: T) => boolean;

Defined in: packages/common/src/Types.ts:90

Checks a condition on a value and returns a boolean.

A predicate starts with an 'is' prefix, e.g., isEven.

Filtering values

import { assertEqual, type Predicate } from "@evolu/common";

const isEven: Predicate<number> = (n) => n % 2 === 0;

assertEqual([1, 2, 3, 4].filter(isEven), [2, 4]);
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