_clone.js•1.13 kB
var _cloneRegExp = require('./_cloneRegExp');
var type = require('../type');
/**
* Copies an object.
*
* @private
* @param {*} value The value to be copied
* @param {Array} refFrom Array containing the source references
* @param {Array} refTo Array containing the copied source references
* @param {Boolean} deep Whether or not to perform deep cloning.
* @return {*} The copied value.
*/
module.exports = function _clone(value, refFrom, refTo, deep) {
var copy = function copy(copiedValue) {
var len = refFrom.length;
var idx = 0;
while (idx < len) {
if (value === refFrom[idx]) {
return refTo[idx];
}
idx += 1;
}
refFrom[idx + 1] = value;
refTo[idx + 1] = copiedValue;
for (var key in value) {
copiedValue[key] = deep ?
_clone(value[key], refFrom, refTo, true) : value[key];
}
return copiedValue;
};
switch (type(value)) {
case 'Object': return copy({});
case 'Array': return copy([]);
case 'Date': return new Date(value.valueOf());
case 'RegExp': return _cloneRegExp(value);
default: return value;
}
};