30 lines
934 B
JavaScript
30 lines
934 B
JavaScript
var eq = require('./eq');
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/** Used for built-in method references. */
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var objectProto = Object.prototype;
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/** Used to check objects for own properties. */
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var hasOwnProperty = objectProto.hasOwnProperty;
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/**
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* Used by `_.defaults` to customize its `_.assignIn` use to assign properties
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* of source objects to the destination object for all destination properties
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* that resolve to `undefined`.
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*
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* @private
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* @param {*} objValue The destination value.
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* @param {*} srcValue The source value.
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* @param {string} key The key of the property to assign.
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* @param {Object} object The parent object of `objValue`.
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* @returns {*} Returns the value to assign.
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*/
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function customDefaultsAssignIn(objValue, srcValue, key, object) {
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if (objValue === undefined ||
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(eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {
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return srcValue;
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}
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return objValue;
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}
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module.exports = customDefaultsAssignIn;
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