lodash/concat.js

var arrayConcat = require('./_arrayConcat'),
    baseFlatten = require('./_baseFlatten'),
    isArray = require('./isArray'),
    rest = require('./rest');

/**
 * Creates a new array concatenating `array` with any additional arrays
 * and/or values.
 *
 * @static
 * @memberOf _
 * @category Array
 * @param {Array} array The array to concatenate.
 * @param {...*} [values] The values to concatenate.
 * @returns {Array} Returns the new concatenated array.
 * @example
 *
 * var array = [1];
 * var other = _.concat(array, 2, [3], [[4]]);
 *
 * console.log(other);
 * // => [1, 2, 3, [4]]
 *
 * console.log(array);
 * // => [1]
 */
var concat = rest(function(array, values) {
  if (!isArray(array)) {
    array = array == null ? [] : [Object(array)];
  }
  values = baseFlatten(values, 1);
  return arrayConcat(array, values);
});

module.exports = concat;