lodash/internal/baseCopy.js

define([], function() {

  /**
   * Copies the properties of `source` to `object`.
   *
   * @private
   * @param {Object} source The object to copy properties from.
   * @param {Object} [object={}] The object to copy properties to.
   * @param {Array} props The property names to copy.
   * @returns {Object} Returns `object`.
   */
  function baseCopy(source, object, props) {
    if (!props) {
      props = object;
      object = {};
    }
    var index = -1,
        length = props.length;

    while (++index < length) {
      var key = props[index];
      object[key] = source[key];
    }
    return object;
  }

  return baseCopy;
});