f-utility/lib/invert.js

functional utilities

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
/**
 * @method not
 * @param {*} x - any
 * @returns {boolean} !x
 * @public
 * @example
 * import {pipe, not} from 'f-utility'
 * const isOdd = pipe(
 *   (x) => x % 2 === 0,
 *   not
 * )
 */
var not = exports.not = function not(x) {
  return !x;
};

var invert = exports.invert = function invert(x) {
  return Object.keys(x).reduce(function (o, key) {
    var value = x[key];
    o[value] = o[value] ? o[value].concat(key) : [key];
    return o;
  }, {});
};