time-to-botec

Benchmark sampling in different programming languages
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_customDefaultsAssignIn.js (934B)

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