Last change
on this file since 8d391a1 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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100644
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File size:
1.1 KB
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[6a3a178] | 1 | 'use strict';
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| 2 | var $ = require('../internals/export');
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| 3 | var toInteger = require('../internals/to-integer');
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| 4 | var parseInt = require('../internals/number-parse-int');
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| 5 |
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| 6 | var INVALID_NUMBER_REPRESENTATION = 'Invalid number representation';
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| 7 | var INVALID_RADIX = 'Invalid radix';
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| 8 | var valid = /^[\da-z]+$/;
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| 9 |
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| 10 | // `Number.fromString` method
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| 11 | // https://github.com/tc39/proposal-number-fromstring
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| 12 | $({ target: 'Number', stat: true }, {
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| 13 | fromString: function fromString(string, radix) {
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| 14 | var sign = 1;
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| 15 | var R, mathNum;
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| 16 | if (typeof string != 'string') throw TypeError(INVALID_NUMBER_REPRESENTATION);
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| 17 | if (!string.length) throw SyntaxError(INVALID_NUMBER_REPRESENTATION);
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| 18 | if (string.charAt(0) == '-') {
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| 19 | sign = -1;
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| 20 | string = string.slice(1);
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| 21 | if (!string.length) throw SyntaxError(INVALID_NUMBER_REPRESENTATION);
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| 22 | }
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| 23 | R = radix === undefined ? 10 : toInteger(radix);
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| 24 | if (R < 2 || R > 36) throw RangeError(INVALID_RADIX);
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| 25 | if (!valid.test(string) || (mathNum = parseInt(string, R)).toString(R) !== string) {
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| 26 | throw SyntaxError(INVALID_NUMBER_REPRESENTATION);
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| 27 | }
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| 28 | return sign * mathNum;
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| 29 | }
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| 30 | });
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