| var isIterateeCall = require('../internal/isIterateeCall'), |
| trim = require('./trim'); |
| |
| /** Used to detect hexadecimal string values. */ |
| var reHasHexPrefix = /^0[xX]/; |
| |
| /* Native method references for those with the same name as other `lodash` methods. */ |
| var nativeParseInt = global.parseInt; |
| |
| /** |
| * 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] |
| */ |
| 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)); |
| } |
| |
| module.exports = parseInt; |