crocks/helpers/unary.js

A collection of well known Algebraic Datatypes for your utter enjoyment.

/** @license ISC License (c) copyright 2017 original and current authors */
/** @author Ian Hofmann-Hicks (evil) */

var isFunction = require('../core/isFunction')

// unary : (* -> b) -> a -> b
function unary(fn) {
  if(!isFunction(fn)) {
    throw new TypeError('unary: Function required')
  }

  return function(x) {
    return fn(x)
  }
}

module.exports = unary