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40 lines
1.5 KiB
40 lines
1.5 KiB
3 years ago
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'use strict';
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var $ = require('../internals/export');
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var global = require('../internals/global');
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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 = global.RangeError;
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var SyntaxError = global.SyntaxError;
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var TypeError = global.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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