parseInt.js (1256B)
1 var root = require('./_root'), 2 toString = require('./toString'); 3 4 /** Used to match leading whitespace. */ 5 var reTrimStart = /^\s+/; 6 7 /* Built-in method references for those with the same name as other `lodash` methods. */ 8 var nativeParseInt = root.parseInt; 9 10 /** 11 * Converts `string` to an integer of the specified radix. If `radix` is 12 * `undefined` or `0`, a `radix` of `10` is used unless `value` is a 13 * hexadecimal, in which case a `radix` of `16` is used. 14 * 15 * **Note:** This method aligns with the 16 * [ES5 implementation](https://es5.github.io/#x15.1.2.2) of `parseInt`. 17 * 18 * @static 19 * @memberOf _ 20 * @since 1.1.0 21 * @category String 22 * @param {string} string The string to convert. 23 * @param {number} [radix=10] The radix to interpret `value` by. 24 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. 25 * @returns {number} Returns the converted integer. 26 * @example 27 * 28 * _.parseInt('08'); 29 * // => 8 30 * 31 * _.map(['6', '08', '10'], _.parseInt); 32 * // => [6, 8, 10] 33 */ 34 function parseInt(string, radix, guard) { 35 if (guard || radix == null) { 36 radix = 0; 37 } else if (radix) { 38 radix = +radix; 39 } 40 return nativeParseInt(toString(string).replace(reTrimStart, ''), radix || 0); 41 } 42 43 module.exports = parseInt;