Nordic number formatter; using , as decimal point when precision>0, and space as thousand separator otherwise (made for a pretty specific application)

Number.formatNordic.js

// Nordic number formatter; using , as decimal point when precision>0,
// and space as thousand separator otherwise
Number.prototype.formatNordic = function(precision) {
    precision = precision || 0;
    var rounded = Math.round(+this * Math.pow(10, precision)) / Math.pow(10, precision);
    var result = rounded.toString().replace(".",",");
    if (+precision > 0) {
        var pos = result.indexOf(',');
        if (pos == -1)
            result += "," + '0'.repeat(precision);
        else if ((pos+parseInt(precision)) <= result.length)
            result += '0'.repeat(precision - (result.length - pos - 1));
    } else {
        // Thousand separator only when precision = 0
        var result = rounded.toString();
        var len = result.length;
        for (var x = 0; x < len; x++)
        {
            var offset = len - x - 1;
            if ((x % 3) == 0 && x > 0)
                result = result.splice(offset+1, 0, ' ');
        }
    }
    return result;
}