1  var createPadding = require('./_createPadding'),
 2      stringSize = require('./_stringSize'),
 3      toInteger = require('./toInteger'),
 4      toString = require('./toString');
 5  
 6  /* Built-in method references for those with the same name as other `lodash` methods. */
 7  var nativeCeil = Math.ceil,
 8      nativeFloor = Math.floor;
 9  
10  /**
11   * Pads `string` on the left and right sides if it's shorter than `length`.
12   * Padding characters are truncated if they can't be evenly divided by `length`.
13   *
14   * @static
15   * @memberOf _
16   * @since 3.0.0
17   * @category String
18   * @param {string} [string=''] The string to pad.
19   * @param {number} [length=0] The padding length.
20   * @param {string} [chars=' '] The string used as padding.
21   * @returns {string} Returns the padded string.
22   * @example
23   *
24   * _.pad('abc', 8);
25   * // => '  abc   '
26   *
27   * _.pad('abc', 8, '_-');
28   * // => '_-abc_-_'
29   *
30   * _.pad('abc', 3);
31   * // => 'abc'
32   */
33  function pad(string, length, chars) {
34    string = toString(string);
35    length = toInteger(length);
36  
37    var strLength = length ? stringSize(string) : 0;
38    if (!length || strLength >= length) {
39      return string;
40    }
41    var mid = (length - strLength) / 2;
42    return (
43      createPadding(nativeFloor(mid), chars) +
44      string +
45      createPadding(nativeCeil(mid), chars)
46    );
47  }
48  
49  module.exports = pad;