mirror of https://github.com/jkjoy/sunpeiwen.git
74 lines
1.8 KiB
JavaScript
74 lines
1.8 KiB
JavaScript
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'use strict';
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/**
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* High performance assign before node6
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* @param {Object} target - target object
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* @param {Object | Array} objects - object assign from
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* @return {Object} - return target object
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*/
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exports.assign = function(target, objects) {
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if (!Array.isArray(objects)) {
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objects = [ objects ];
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}
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for (var i = 0; i < objects.length; i++) {
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var obj = objects[i];
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if (obj) {
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var keys = Object.keys(obj);
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for (var j = 0; j < keys.length; j++) {
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var key = keys[j];
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target[key] = obj[key];
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}
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}
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}
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return target;
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};
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exports.has = function has(obj, prop) {
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return Object.prototype.hasOwnProperty.call(obj, prop);
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};
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/**
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* Get all enumerable and ownership of property names
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* @param {Object} obj - detect object
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* @param {Boolean} [ignoreNull] - ignore null, undefined or NaN property
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* @return {Array<String>} property names
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*/
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exports.getOwnEnumerables = function getOwnEnumerables(obj, ignoreNull) {
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if (!obj || typeof obj !== 'object' || Array.isArray(obj)) {
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return [];
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}
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return Object.keys(obj).filter(function(key) {
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if (ignoreNull) {
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var value = obj[key];
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if (value === null || value === undefined || Number.isNaN(value)) {
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return false;
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}
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}
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return exports.has(obj, key);
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});
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};
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/**
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* generate a real map object(clean object), no constructor, no __proto__
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* @param {Object} [obj] - init object, optional
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* @return {Object}
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*/
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exports.map = function map(obj) {
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var map = new EmptyObject();
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if (!obj) {
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return map;
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}
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for (var key in obj) {
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map[key] = obj[key];
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}
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return map;
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};
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// faster way like `Object.create(null)` to get a 'clean' empty object
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// https://github.com/nodejs/node/blob/master/lib/events.js#L5
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// https://cnodejs.org/topic/571e0c445a26c4a841ecbcf1
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function EmptyObject() {}
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EmptyObject.prototype = Object.create(null);
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