#allPass

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

When every input is a type guard, the result narrows to the intersection of every guard's target type. Plain boolean predicates contribute nothing to the narrowing (they fall back to no-op).

const isPositiveEven = allPass([(n: number) => n > 0, (n: number) => n % 2 === 0])
isPositiveEven(4) // true

const isNonEmptyString = allPass([isString, isNotEmpty])
if (isNonEmptyString(x)) {
  // x is narrowed to string here
}

#Usage

#allPass(predicates: ReadonlyArray<(value: unknown) => boolean>)

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

When every input is a type guard, the result narrows to the intersection of every guard's target type. Plain boolean predicates contribute nothing to the narrowing (they fall back to no-op).

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

const isPositiveEven = allPass([(n: number) => n > 0, (n: number) => n % 2 === 0])
isPositiveEven(4) // true

const isNonEmptyString = allPass([isString, isNotEmpty])
if (isNonEmptyString(x)) {
  // x is narrowed to string here
}

#Parameters

#Returns

a predicate that returns true only when every supplied predicate passes.

(value: unknown) => boolean