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authorruki <waruqi@gmail.com>2018-11-08 00:38:48 +0800
committerruki <waruqi@gmail.com>2018-11-07 21:53:09 +0800
commit26105034da4fcce7ac883c899d781f016559310d (patch)
treec459a5dc4e3aa0972d9919033ece511ce76dd129 /node_modules/lodash/_customDefaultsAssignIn.js
parent2c77f00f1a7ecb6c8192f9c16d3b2001b254a107 (diff)
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+var eq = require('./eq');
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
+/**
+ * Used by `_.defaults` to customize its `_.assignIn` use to assign properties
+ * of source objects to the destination object for all destination properties
+ * that resolve to `undefined`.
+ *
+ * @private
+ * @param {*} objValue The destination value.
+ * @param {*} srcValue The source value.
+ * @param {string} key The key of the property to assign.
+ * @param {Object} object The parent object of `objValue`.
+ * @returns {*} Returns the value to assign.
+ */
+function customDefaultsAssignIn(objValue, srcValue, key, object) {
+ if (objValue === undefined ||
+ (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {
+ return srcValue;
+ }
+ return objValue;
+}
+
+module.exports = customDefaultsAssignIn;