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38 lines
1.5 KiB
38 lines
1.5 KiB
'use strict'; |
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var $ = require('../internals/export'); |
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var uncurryThis = require('../internals/function-uncurry-this'); |
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var toIntegerOrInfinity = require('../internals/to-integer-or-infinity'); |
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var parseInt = require('../internals/number-parse-int'); |
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var INVALID_NUMBER_REPRESENTATION = 'Invalid number representation'; |
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var INVALID_RADIX = 'Invalid radix'; |
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var $RangeError = RangeError; |
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var $SyntaxError = SyntaxError; |
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var $TypeError = TypeError; |
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var valid = /^[\da-z]+$/; |
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var charAt = uncurryThis(''.charAt); |
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var exec = uncurryThis(valid.exec); |
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var numberToString = uncurryThis(1.0.toString); |
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var stringSlice = uncurryThis(''.slice); |
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// `Number.fromString` method |
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// https://github.com/tc39/proposal-number-fromstring |
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$({ target: 'Number', stat: true, forced: true }, { |
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fromString: function fromString(string, radix) { |
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var sign = 1; |
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var R, mathNum; |
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if (typeof string != 'string') throw $TypeError(INVALID_NUMBER_REPRESENTATION); |
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if (!string.length) throw $SyntaxError(INVALID_NUMBER_REPRESENTATION); |
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if (charAt(string, 0) == '-') { |
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sign = -1; |
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string = stringSlice(string, 1); |
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if (!string.length) throw $SyntaxError(INVALID_NUMBER_REPRESENTATION); |
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} |
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R = radix === undefined ? 10 : toIntegerOrInfinity(radix); |
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if (R < 2 || R > 36) throw $RangeError(INVALID_RADIX); |
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if (!exec(valid, string) || numberToString(mathNum = parseInt(string, R), R) !== string) { |
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throw $SyntaxError(INVALID_NUMBER_REPRESENTATION); |
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} |
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return sign * mathNum; |
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} |
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});
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