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Edit File: _copyObject.js

var assignValue = require('./_assignValue'),
    baseAssignValue = require('./_baseAssignValue');

/**
 * Copies properties of `source` to `object`.
 *
 * @private
 * @param {Object} source The object to copy properties from.
 * @param {Array} props The property identifiers to copy.
 * @param {Object} [object={}] The object to copy properties to.
 * @param {Function} [customizer] The function to customize copied values.
 * @returns {Object} Returns `object`.
 */
function copyObject(source, props, object, customizer) {
  var isNew = !object;
  object || (object = {});

var index = -1,
      length = props.length;

while (++index < length) {
    var key = props[index];

var newValue = customizer
      ? customizer(object[key], source[key], key, object, source)
      : undefined;

if (newValue === undefined) {
      newValue = source[key];
    }
    if (isNew) {
      baseAssignValue(object, key, newValue);
    } else {
      assignValue(object, key, newValue);
    }
  }
  return object;
}

module.exports = copyObject;

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