source: frontend/node_modules/es-abstract/5/ToNumber.js

'use strict';

var ToPrimitive = require('./ToPrimitive');

var callBound = require('call-bound');

var $replace = callBound('String.prototype.replace');

var safeRegexTester = require('safe-regex-test');

var isNonDecimal = safeRegexTester(/^0[ob]|^[+-]0x/);

var $Number = Number;

// http://262.ecma-international.org/5.1/#sec-9.3

module.exports = function ToNumber(value) {
        var prim = ToPrimitive(value, $Number);
        if (typeof prim !== 'string') {
                return $Number(prim);
        }

        var trimmed = $replace(
                prim,
                // eslint-disable-next-line no-control-regex
                /^[ \t\x0b\f\xa0\ufeff\n\r\u2028\u2029\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000\u0085]+|[ \t\x0b\f\xa0\ufeff\n\r\u2028\u2029\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000\u0085]+$/g,
                ''
        );
        if (isNonDecimal(trimmed)) {
                return NaN;
        }

        return +trimmed;
};