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musix-oss/node_modules/core-js/modules/esnext.number.from-string.js
2019-10-10 16:43:04 +03:00

31 lines
1.1 KiB
JavaScript

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