#both

Returns a predicate that checks if a value satisfies both predicates.

Binary AND combinator — shorthand for allPass([f, g]). When both inputs are type guards, the result narrows to the intersection of their target types.

const isPositiveEven = both((n: number) => n > 0, (n: number) => n % 2 === 0)
isPositiveEven(4)

#Usage

#both<T>(f: (value: T) => boolean, g: (value: T) => boolean)

Returns a predicate that checks if a value satisfies both predicates.

Binary AND combinator — shorthand for allPass([f, g]). When both inputs are type guards, the result narrows to the intersection of their target types.

import { both } from 'massaman'
// or:  import { both } from 'massaman/predicate'

const isPositiveEven = both((n: number) => n > 0, (n: number) => n % 2 === 0)
isPositiveEven(4)

#Parameters

#Returns

a predicate that returns true only when both predicates pass.

(value: T) => boolean