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47 lines
1.5 KiB
JavaScript
47 lines
1.5 KiB
JavaScript
var isIterateeCall = require('../internal/isIterateeCall'),
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trim = require('./trim');
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/** Used to detect hexadecimal string values. */
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var reHasHexPrefix = /^0[xX]/;
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/* Native method references for those with the same name as other `lodash` methods. */
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var nativeParseInt = global.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/#E)
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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 a callback 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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// Firefox < 21 and Opera < 15 follow ES3 for `parseInt`.
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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 ? isIterateeCall(string, radix, 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 = trim(string);
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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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