50 lines
1.5 KiB
JavaScript
50 lines
1.5 KiB
JavaScript
var root = require('./_root'),
|
|
toString = require('./toString');
|
|
|
|
/** Used to match leading and trailing whitespace. */
|
|
var reTrim = /^\s+|\s+$/g;
|
|
|
|
/** Used to detect hexadecimal string values. */
|
|
var reHasHexPrefix = /^0x/i;
|
|
|
|
/* Built-in method references for those with the same name as other `lodash` methods. */
|
|
var nativeParseInt = root.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/#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]
|
|
*/
|
|
function parseInt(string, radix, guard) {
|
|
// Chrome fails to trim leading <BOM> whitespace characters.
|
|
// See https://bugs.chromium.org/p/v8/issues/detail?id=3109 for more details.
|
|
if (guard || radix == null) {
|
|
radix = 0;
|
|
} else if (radix) {
|
|
radix = +radix;
|
|
}
|
|
string = toString(string).replace(reTrim, '');
|
|
return nativeParseInt(string, radix || (reHasHexPrefix.test(string) ? 16 : 10));
|
|
}
|
|
|
|
module.exports = parseInt;
|