1  var baseRest = require('./_baseRest'),
 2      isIterateeCall = require('./_isIterateeCall');
 3  
 4  /**
 5   * Creates a function like `_.assign`.
 6   *
 7   * @private
 8   * @param {Function} assigner The function to assign values.
 9   * @returns {Function} Returns the new assigner function.
10   */
11  function createAssigner(assigner) {
12    return baseRest(function(object, sources) {
13      var index = -1,
14          length = sources.length,
15          customizer = length > 1 ? sources[length - 1] : undefined,
16          guard = length > 2 ? sources[2] : undefined;
17  
18      customizer = (assigner.length > 3 && typeof customizer == 'function')
19        ? (length--, customizer)
20        : undefined;
21  
22      if (guard && isIterateeCall(sources[0], sources[1], guard)) {
23        customizer = length < 3 ? undefined : customizer;
24        length = 1;
25      }
26      object = Object(object);
27      while (++index < length) {
28        var source = sources[index];
29        if (source) {
30          assigner(object, source, index, customizer);
31        }
32      }
33      return object;
34    });
35  }
36  
37  module.exports = createAssigner;