githubmirror/lodash

_baseMerge.js
40 строк1 KB
John-David Dalton
Bump to v4.17.12.
09 июл 2019, 23:47
09 июл 2019, 23:47f42b961
define(['./_Stack', './_assignMergeValue', './_baseFor', './_baseMergeDeep', './isObject', './keysIn', './_safeGet'], function(Stack, assignMergeValue, baseFor, baseMergeDeep, isObject, keysIn, safeGet) {

  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
  var undefined;

  /**
   * The base implementation of `_.merge` without support for multiple sources.
   *
   * @private
   * @param {Object} object The destination object.
   * @param {Object} source The source object.
   * @param {number} srcIndex The index of `source`.
   * @param {Function} [customizer] The function to customize merged values.
   * @param {Object} [stack] Tracks traversed source values and their merged
   *  counterparts.
   */
  function baseMerge(object, source, srcIndex, customizer, stack) {
    if (object === source) {
      return;
    }
    baseFor(source, function(srcValue, key) {
      stack || (stack = new Stack);
      if (isObject(srcValue)) {
        baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
      }
      else {
        var newValue = customizer
          ? customizer(safeGet(object, key), srcValue, (key + ''), object, source, stack)
          : undefined;

        if (newValue === undefined) {
          newValue = srcValue;
        }
        assignMergeValue(object, key, newValue);
      }
    }, keysIn);
  }

  return baseMerge;
});