B (Boolean)

not_(a: boolean): boolean
and_(a: boolean, b: boolean): boolean      // dual
or_(a: boolean, b: boolean): boolean       // dual
ifElse<A>(cond: boolean, onTrue: () => A, onFalse: () => A): A  // dual

Trailing underscores avoid colliding with JS reserved words.

Examples

import { pipe, B } from '@stopcock/fp'

pipe(true, B.not_)           // false
pipe(true, B.and_(false))    // false
pipe(false, B.ifElse(() => 'yes', () => 'no'))  // 'no'

// toggle a feature flag
const toggled = pipe(isEnabled, B.not_)

// both conditions must hold
const canAccess = pipe(isAdmin, B.and_(isActive))