function parseInt(string, radix, guard) {
      if (guard || radix == null) {
        radix = 0;
      } else if (radix) {
        radix = +radix;
      }
      return nativeParseInt(toString(string).replace(reTrimStart, ''), radix || 0);
    }
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/#x15.1.2.2) of `parseInt`.

@static
@memberOf _
@since 1.1.0
@category String
@param {string} string The string to convert.
@param {number} [radix=10] The radix to interpret `value` by.
@param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
@returns {number} Returns the converted integer.
@example

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

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