100 lines
1.9 KiB
JavaScript
100 lines
1.9 KiB
JavaScript
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/*!
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* make-iterator <https://github.com/jonschlinkert/make-iterator>
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*
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* Copyright (c) 2014-2018, Jon Schlinkert.
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* Released under the MIT License.
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*/
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'use strict';
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var typeOf = require('kind-of');
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module.exports = function makeIterator(target, thisArg) {
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switch (typeOf(target)) {
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case 'undefined':
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case 'null':
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return noop;
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case 'function':
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// function is the first to improve perf (most common case)
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// also avoid using `Function#call` if not needed, which boosts
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// perf a lot in some cases
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return (typeof thisArg !== 'undefined') ? function(val, i, arr) {
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return target.call(thisArg, val, i, arr);
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} : target;
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case 'object':
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return function(val) {
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return deepMatches(val, target);
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};
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case 'regexp':
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return function(str) {
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return target.test(str);
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};
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case 'string':
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case 'number':
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default: {
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return prop(target);
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}
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}
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};
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function containsMatch(array, value) {
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var len = array.length;
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var i = -1;
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while (++i < len) {
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if (deepMatches(array[i], value)) {
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return true;
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}
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}
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return false;
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}
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function matchArray(arr, value) {
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var len = value.length;
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var i = -1;
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while (++i < len) {
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if (!containsMatch(arr, value[i])) {
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return false;
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}
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}
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return true;
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}
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function matchObject(obj, value) {
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for (var key in value) {
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if (value.hasOwnProperty(key)) {
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if (deepMatches(obj[key], value[key]) === false) {
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return false;
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}
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}
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}
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return true;
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}
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/**
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* Recursively compare objects
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*/
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function deepMatches(val, value) {
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if (typeOf(val) === 'object') {
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if (Array.isArray(val) && Array.isArray(value)) {
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return matchArray(val, value);
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} else {
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return matchObject(val, value);
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}
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} else {
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return val === value;
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}
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}
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function prop(name) {
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return function(obj) {
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return obj[name];
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};
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}
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function noop(val) {
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return val;
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}
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