Function baseMerge

lib/web/jshint.js:3909–3943

* The base implementation of `_.merge` without support for argument juggling, * multiple sources, and `this` binding `customizer` functions. * * @private * @param {Object} object The destination object. * @param {Object} source The source object. * @param {Function} [cu

(object, source, customizer, stackA, stackB)

     * @returns {Object} Returns `object`.
     */
    function baseMerge(object, source, customizer, stackA, stackB) {
      if (!isObject(object)) {
        return object;
      }
      var isSrcArr = isLength(source.length) && (isArray(source) || isTypedArray(source));
      if (!isSrcArr) {
        var props = keys(source);
        push.apply(props, getSymbols(source));
      }
      arrayEach(props || source, function(srcValue, key) {
        if (props) {
          key = srcValue;
          srcValue = source[key];
        }
        if (isObjectLike(srcValue)) {
          stackA || (stackA = []);
          stackB || (stackB = []);
          baseMergeDeep(object, source, key, baseMerge, customizer, stackA, stackB);
        }
        else {
          var value = object[key],
              result = customizer ? customizer(value, srcValue, key, object, source) : undefined,
              isCommon = result === undefined;

          if (isCommon) {
            result = srcValue;
          }
          if ((isSrcArr || result !== undefined) &&
              (isCommon || (result === result ? (result !== value) : (value === value)))) {
            object[key] = result;
          }
        }
      });
      return object;
    }

    /**
     * A specialized version of `baseMerge` for arrays and objects which performs