glob-fs/lib/utils.js

file globbing for node.js. speedy and powerful alternative to node-glob.

'use strict';

/**
 * Utils
 */

var utils = module.exports;

/**
 * Cast `val` to an array.
 *
 * @param  {String|Array} `val`
 * @return {Array}
 */

utils.arrayify = function arrayify(val) {
  return val ? (Array.isArray(val) ? val : [val]) : [];
};

/**
 * Concatenate and flatten multiple arrays, filtering
 * falsey values from the result set.
 *
 * @param {Array} `arrays` One or more arrays
 * @return {Array}
 */

utils.union = function union() {
  var arr = [].concat.apply([], [].slice.call(arguments));
  return utils.flatten(arr).filter(Boolean);
};

/**
 * Add a non-enumerable property to `receiver`
 *
 * @param  {Object} `obj`
 * @param  {String} `name`
 * @param  {Function} `val`
 */

utils.defineProp = function defineProp(receiver, key, value) {
  return Object.defineProperty(receiver, key, {
    configurable: true,
    enumerable: false,
    writable: true,
    value: value
  });
};