time-to-botec

Benchmark sampling in different programming languages
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_copyObject.js (1044B)

      1 var assignValue = require('./_assignValue'),
      2     baseAssignValue = require('./_baseAssignValue');
      3 
      4 /**
      5  * Copies properties of `source` to `object`.
      6  *
      7  * @private
      8  * @param {Object} source The object to copy properties from.
      9  * @param {Array} props The property identifiers to copy.
     10  * @param {Object} [object={}] The object to copy properties to.
     11  * @param {Function} [customizer] The function to customize copied values.
     12  * @returns {Object} Returns `object`.
     13  */
     14 function copyObject(source, props, object, customizer) {
     15   var isNew = !object;
     16   object || (object = {});
     17 
     18   var index = -1,
     19       length = props.length;
     20 
     21   while (++index < length) {
     22     var key = props[index];
     23 
     24     var newValue = customizer
     25       ? customizer(object[key], source[key], key, object, source)
     26       : undefined;
     27 
     28     if (newValue === undefined) {
     29       newValue = source[key];
     30     }
     31     if (isNew) {
     32       baseAssignValue(object, key, newValue);
     33     } else {
     34       assignValue(object, key, newValue);
     35     }
     36   }
     37   return object;
     38 }
     39 
     40 module.exports = copyObject;