OLAS/node_modules/make-iterator/index.js

/*!
 * make-iterator <https://github.com/jonschlinkert/make-iterator>
 *
 * Copyright (c) 2014, 2017, Jon Schlinkert.
 * Released under the MIT License.
 */

'use strict';

var typeOf = require('kind-of');

module.exports = function makeIterator(target, thisArg) {
  switch (typeOf(target)) {
    case 'undefined':
    case 'null':
      return noop;
    case 'function':
      // function is the first to improve perf (most common case)
      // also avoid using `Function#call` if not needed, which boosts
      // perf a lot in some cases
      return (typeof thisArg !== 'undefined') ? function(val, i, arr) {
        return target.call(thisArg, val, i, arr);
      } : target;
    case 'object':
      return function(val) {
        return deepMatches(val, target);
      };
    case 'regexp':
      return function(str) {
        return target.test(str);
      };
    case 'string':
    case 'number':
    default: {
      return prop(target);
    }
  }
};

function containsMatch(array, value) {
  var len = array.length;
  var i = -1;

  while (++i < len) {
    if (deepMatches(array[i], value)) {
      return true;
    }
  }
  return false;
}

function matchArray(arr, value) {
  var len = value.length;
  var i = -1;

  while (++i < len) {
    if (!containsMatch(arr, value[i])) {
      return false;
    }
  }
  return true;
}

function matchObject(obj, value) {
  for (var key in value) {
    if (value.hasOwnProperty(key)) {
      if (deepMatches(obj[key], value[key]) === false) {
        return false;
      }
    }
  }
  return true;
}

/**
 * Recursively compare objects
 */

function deepMatches(val, value) {
  if (typeOf(val) === 'object') {
    if (Array.isArray(val) && Array.isArray(value)) {
      return matchArray(val, value);
    } else {
      return matchObject(val, value);
    }
  } else {
    return val === value;
  }
}

function prop(name) {
  return function(obj) {
    return obj[name];
  };
}

function noop(val) {
  return val;
}