Hello nice solution but due to compatibility of fromatToParts! what do you think about the following class class UniParser { constructor(local) { this._decimal = new Intl.NumberFormat(local, { useGrouping: false }).format(9.9).charAt(1); this._numerals = new Intl.NumberFormat(local, { useGrouping: false }).format(9876543210).split('').reverse(); this._regx = new RegExp('[' + this._numerals + ']', "g"); } parse(string) { let self = this; return Number(string.replace(this._regx, function (match) { return self._numerals.indexOf(match); }).replace(self._decimal, '.')); } }

ah I forgot to replace grouping symbol ! additional replace can solve it

If it works for you, then great! The ideas presented in this notebook are just a sketch (a hack), trying to adapt Intl.NumberFormat to support localized parsing. As I mentioned, this makes a number of assumptions and almost certainly doesn’t generalize to all locales, but maybe it’s better than nothing?

no it doesn't work !

found it! return (self._numerals.indexOf(match)>=0) ? self._numerals.indexOf(match) : '';

There is a bug in here when the group token is whitespace. Repro test case: numberParser('fr-CA', '1 999,99'); // returns NaN This is because _group Regexp is constructed as /[ ]/, and what we really want in this case is probably /[\s]/

Here is my fix: // modified slightly from his observable. because the group separator doesn't handle whitespace. // e.g., numberParser('fr-CA', '1 999,99') // returns NaN // this is because the group regex is generated as /[ ]/ when we really want /[\s]/ const groupVal = parts.find(d => d.type === 'group').value; const isWhiteSpace = /\s/.test( typeof groupVal === 'number' ? String.fromCodePoint(groupVal) : groupVal.charAt(0) ) const _group = new RegExp(`[${isWhiteSpace ? '\\s' : groupVal}]`, 'g');