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Optimize isPlainObject use in _.clone.

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Former-commit-id: 7bb48bc5f9276c730f947b6e75b6fba4588f17c1
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John-David Dalton
2012-08-17 08:16:31 -07:00
parent b43684262f
commit f9f08ba54f
1 changed files with 7 additions and 4 deletions
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11
lodash.js
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@@ -746,12 +746,15 @@
* *
* @private * @private
* @param {Mixed} value The value to check. * @param {Mixed} value The value to check.
* @returns {Boolean} Returns `true` if the `value` is a plain `Object` object, else `false`. * @param {Boolean} [skipArgsCheck=false] Internally used to skip checks for
* `arguments` objects.
* @returns {Boolean} Returns `true` if the `value` is a plain `Object` object,
* else `false`.
*/ */
function isPlainObject(value) { function isPlainObject(value, skipArgsCheck) {
// avoid non-objects and false positives for `arguments` objects // avoid non-objects and false positives for `arguments` objects
var result = false; var result = false;
if (!(value && typeof value == 'object') || isArguments(value)) { if (!(value && typeof value == 'object') || (!skipArgsCheck && isArguments(value))) {
return result; return result;
} }
// IE < 9 presents DOM nodes as `Object` objects except they have `toString` // IE < 9 presents DOM nodes as `Object` objects except they have `toString`
@@ -1015,7 +1018,7 @@
return value; return value;
} }
var isArr = className == arrayClass; var isArr = className == arrayClass;
isObj = isArr || (className == objectClass ? isPlainObject(value) : isObj); isObj = isArr || (className == objectClass ? isPlainObject(value, true) : isObj);
} }
// shallow clone // shallow clone
if (!isObj || !deep) { if (!isObj || !deep) {