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48 lines
1.5 KiB
48 lines
1.5 KiB
var root = require('./_root'),
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toString = require('./toString');
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/** Used to match leading and trailing whitespace. */
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var reTrim = /^\s+|\s+$/g;
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/** Used to detect hexadecimal string values. */
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var reHasHexPrefix = /^0x/i;
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/* Built-in method references for those with the same name as other `lodash` methods. */
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var nativeParseInt = root.parseInt;
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/**
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* Converts `string` to an integer of the specified radix. If `radix` is
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* `undefined` or `0`, a `radix` of `10` is used unless `value` is a hexadecimal,
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* in which case a `radix` of `16` is used.
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*
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* **Note:** This method aligns with the [ES5 implementation](https://es5.github.io/#x15.1.2.2)
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* of `parseInt`.
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*
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* @static
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* @memberOf _
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* @category String
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* @param {string} string The string to convert.
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* @param {number} [radix] The radix to interpret `value` by.
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* @param- {Object} [guard] Enables use as an iteratee for functions like `_.map`.
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* @returns {number} Returns the converted integer.
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* @example
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*
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* _.parseInt('08');
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* // => 8
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*
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* _.map(['6', '08', '10'], _.parseInt);
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* // => [6, 8, 10]
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*/
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function parseInt(string, radix, guard) {
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// Chrome fails to trim leading <BOM> whitespace characters.
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// See https://code.google.com/p/v8/issues/detail?id=3109 for more details.
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if (guard || radix == null) {
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radix = 0;
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} else if (radix) {
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radix = +radix;
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}
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string = toString(string).replace(reTrim, '');
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return nativeParseInt(string, radix || (reHasHexPrefix.test(string) ? 16 : 10));
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}
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module.exports = parseInt;
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