function parseInt(string, radix, guard) {
	      // Firefox < 21 and Opera < 15 follow ES3 for `parseInt`.
	      // Chrome fails to trim leading <BOM> whitespace characters.
	      // See https://code.google.com/p/v8/issues/detail?id=3109 for more details.
	      if (guard ? isIterateeCall(string, radix, guard) : radix == null) {
	        radix = 0;
	      } else if (radix) {
	        radix = +radix;
	      }
	      string = trim(string);
	      return nativeParseInt(string, radix || (reHasHexPrefix.test(string) ? 16 : 10));
	    }
Converts `string` to an integer of the specified radix. If `radix` is
`undefined` or `0`, a `radix` of `10` is used unless `value` is a hexadecimal,
in which case a `radix` of `16` is used.

**Note:** This method aligns with the [ES5 implementation](https://es5.github.io/#E)
of `parseInt`.

@static
@memberOf _
@category String
@param {string} string The string to convert.
@param {number} [radix] The radix to interpret `value` by.
@param- {Object} [guard] Enables use as a callback for functions like `_.map`.
@returns {number} Returns the converted integer.
@example

_.parseInt('08');
// => 8

_.map(['6', '08', '10'], _.parseInt);
// => [6, 8, 10]