crocks/logic/or.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 curry = require('../core/curry')
var isPredOrFunc = require('../core/isPredOrFunc')
var predOrFunc = require('../core/predOrFunc')

// or : (a -> Boolean) | Pred -> (a -> Boolean) | Pred -> a -> Boolean
function or(f, g) {
  if(!(isPredOrFunc(f) && isPredOrFunc(g))) {
    throw new TypeError(
      'or: Preds or predicate functions required for first two arguments'
    )
  }

  return function (x) { return !!(predOrFunc(f, x) || predOrFunc(g, x)); }
}

module.exports = curry(or)