| 1 | var eq = require('./eq');
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| 2 |
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| 3 | /** Used for built-in method references. */
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| 4 | var objectProto = Object.prototype;
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| 5 |
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| 6 | /** Used to check objects for own properties. */
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| 7 | var hasOwnProperty = objectProto.hasOwnProperty;
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| 8 |
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| 9 | /**
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| 10 | * Used by `_.defaults` to customize its `_.assignIn` use to assign properties
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| 11 | * of source objects to the destination object for all destination properties
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| 12 | * that resolve to `undefined`.
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| 13 | *
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| 14 | * @private
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| 15 | * @param {*} objValue The destination value.
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| 16 | * @param {*} srcValue The source value.
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| 17 | * @param {string} key The key of the property to assign.
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| 18 | * @param {Object} object The parent object of `objValue`.
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| 19 | * @returns {*} Returns the value to assign.
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| 20 | */
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| 21 | function customDefaultsAssignIn(objValue, srcValue, key, object) {
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| 22 | if (objValue === undefined ||
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| 23 | (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {
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| 24 | return srcValue;
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| 25 | }
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| 26 | return objValue;
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| 27 | }
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| 28 |
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| 29 | module.exports = customDefaultsAssignIn;
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