lodash/chain/wrapperConcat.js

define(['../internal/arrayConcat', '../internal/baseFlatten', '../lang/isArray', '../function/restParam', '../internal/toObject'], function(arrayConcat, baseFlatten, isArray, restParam, toObject) {

  /**
   * Creates a new array joining a wrapped array with any additional arrays
   * and/or values.
   *
   * @name concat
   * @memberOf _
   * @category Chain
   * @param {...*} [values] The values to concatenate.
   * @returns {Array} Returns the new concatenated array.
   * @example
   *
   * var array = [1];
   * var wrapped = _(array).concat(2, [3], [[4]]);
   *
   * console.log(wrapped.value());
   * // => [1, 2, 3, [4]]
   *
   * console.log(array);
   * // => [1]
   */
  var wrapperConcat = restParam(function(values) {
    values = baseFlatten(values);
    return this.thru(function(array) {
      return arrayConcat(isArray(array) ? array : [toObject(array)], values);
    });
  });

  return wrapperConcat;
});