rambdax/src/unless.js

Extended version of Rambda - a lightweight, faster alternative to Ramda

export function unless(predicate, whenFalse){
  if (arguments.length === 1){
    return _whenFalse => unless(predicate, _whenFalse)
  }

  return input => {
    if (predicate(input)) return input

    return whenFalse(input)
  }
}