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cloneObject.js
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95 lines (86 loc) · 3.21 KB
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/**
* @name cloneObject
* @category utils
* @function
* @description It will clone an object (source: https://stackoverflow.com/questions/122102/what-is-the-most-efficient-way-to-deep-clone-an-object-in-javascript/24248152#comment75410509_24248152)
* @param {Boolean} [deep=false] If we want a deep clone
* @param {Object} objectDestination The object that will be extended
* @param {Object} objectSource The object the copy
*/
export default function cloneObject() {
let to_add, name, copy_is_array, clone, target = arguments[0] || {}, i = 1, length = arguments.length, deep = false;
// Handle a deep copy situation.
if (typeof target === 'boolean') {
deep = target;
// Skip the boolean and the target.
target = arguments[i] || {};
// Use next object as first added.
i++;
}
// Handle case when target is a string or something (possible in deep copy)
if (typeof target !== 'object' && typeof target !== 'function') {
target = {};
}
// Loop trough arguments.
for (false; i < length; i += 1) {
// Only deal with non-null/undefined values
if ((to_add = arguments[i]) !== null) {
// Extend the base object.
for (name in to_add) {
// We do not wrap for loop into hasOwnProperty,
// to access to all values of object.
// Prevent never-ending loop.
if (target === to_add[name] || typeof target[name] !== "undefined") {
continue;
}
// Recurse if we're merging plain objects or arrays.
if (deep && to_add[name] && (is_plain_object(to_add[name]) || (copy_is_array = Array.isArray(to_add[name])))) {
if (copy_is_array) {
copy_is_array = false;
clone = target[name] && Array.isArray(target[name]) ? target[name] : [];
} else {
clone = target[name] && is_plain_object(target[name]) ? target[name] : {};
}
// Never move original objects, clone them.
target[name] = cloneObject(deep, clone, to_add[name]);
}
// Don't bring in undefined values.
else if (to_add[name] !== undefined) {
target[name] = to_add[name];
}
}
}
}
return target;
}
/**
* Check to see if an object is a plain object
* (created using "{}" or "new Object").
* Forked from jQuery.
* @ignore
* @returns {boolean}
*/
function is_plain_object(obj) {
// Not plain objects:
// - Any object or value whose internal [[Class]] property is not "[object Object]"
// - DOM nodes
// - window
if (obj === null || typeof obj !== "object" || obj.nodeType || (obj !== null && obj === obj.window)) {
return false;
}
// Support: Firefox <20
// The try/catch suppresses exceptions thrown when attempting to access
// the "constructor" property of certain host objects, i.e. |window.location|
// https://bugzilla.mozilla.org/show_bug.cgi?id=814622
try {
if (obj.constructor && !this.hasOwnProperty.call(obj.constructor.prototype, "isPrototypeOf")) {
return false;
}
}
catch (e) {
return false;
}
// If the function hasn't returned already, we're confident that
// |obj| is a plain object, created by {} or constructed with new Object
return true;
}