@feugene/mu
Version:
Helpful TS utilities without dependencies
62 lines • 1.96 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.default = clone;
const isDate_1 = __importDefault(require("../is/isDate"));
const enumerables = ['valueOf', 'toLocaleString', 'toString', 'constructor'];
/**
* Clone simple variables including array, {}-like objects, DOM nodes and Date without
* keeping the old reference. A reference for the object itself is returned if it's not
* a direct descendant of Object.
*
* @param {Object} item The variable to clone
* @param {Boolean} [cloneDom=true] `true` to clone DOM nodes.
* @return {Object} clone
*/
function clone(item, cloneDom = true) {
if (item === null || item === undefined) {
return item;
}
// @ts-ignore
if (cloneDom && item.nodeType && item.cloneNode) {
// @ts-ignore
return item.cloneNode(true);
}
const type = Object.prototype.toString.call(item);
// Date
if ((0, isDate_1.default)(item)) {
// @ts-ignore
return new Date(item.getTime());
}
let i, j, k;
// Array
if (Array.isArray(item)) {
i = item.length;
let newClone = [];
while (i--) {
newClone[i] = clone(item[i], cloneDom);
}
return newClone;
}
// Object
if (type === '[object Object]' && item.constructor === Object) {
let key;
let newClone = {};
for (key in item) {
newClone[key] = clone(item[key], cloneDom);
}
if (enumerables) {
for (j = enumerables.length; j--;) {
let k = enumerables[j];
if (Object.prototype.hasOwnProperty.call(item, k)) {
newClone[k] = item[k];
}
}
}
return newClone;
}
return item;
}
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