hexo/node_modules/utility/object.js

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2023-09-25 15:58:56 +08:00
'use strict';
/**
* High performance assign before node6
* @param {Object} target - target object
* @param {Object | Array} objects - object assign from
* @return {Object} - return target object
*/
exports.assign = function(target, objects) {
if (!Array.isArray(objects)) {
objects = [ objects ];
}
for (var i = 0; i < objects.length; i++) {
var obj = objects[i];
if (obj) {
var keys = Object.keys(obj);
for (var j = 0; j < keys.length; j++) {
var key = keys[j];
target[key] = obj[key];
}
}
}
return target;
};
exports.has = function has(obj, prop) {
return Object.prototype.hasOwnProperty.call(obj, prop);
};
/**
* Get all enumerable and ownership of property names
* @param {Object} obj - detect object
* @param {Boolean} [ignoreNull] - ignore null, undefined or NaN property
* @return {Array<String>} property names
*/
exports.getOwnEnumerables = function getOwnEnumerables(obj, ignoreNull) {
if (!obj || typeof obj !== 'object' || Array.isArray(obj)) {
return [];
}
return Object.keys(obj).filter(function(key) {
if (ignoreNull) {
var value = obj[key];
if (value === null || value === undefined || Number.isNaN(value)) {
return false;
}
}
return exports.has(obj, key);
});
};
/**
* generate a real map object(clean object), no constructor, no __proto__
* @param {Object} [obj] - init object, optional
* @return {Object}
*/
exports.map = function map(obj) {
var map = new EmptyObject();
if (!obj) {
return map;
}
for (var key in obj) {
map[key] = obj[key];
}
return map;
};
// faster way like `Object.create(null)` to get a 'clean' empty object
// https://github.com/nodejs/node/blob/master/lib/events.js#L5
// https://cnodejs.org/topic/571e0c445a26c4a841ecbcf1
function EmptyObject() {}
EmptyObject.prototype = Object.create(null);