Function roundNumber

OpenReservation/wwwroot/Scripts/angular.js:20108–20144

* Round the parsed number to the specified number of decimal places * This function changed the parsedNumber in-place

(parsedNumber, fractionSize, minFrac, maxFrac)

     * This function changed the parsedNumber in-place
     */
    function roundNumber(parsedNumber, fractionSize, minFrac, maxFrac) {
        var digits = parsedNumber.d;
        var fractionLen = digits.length - parsedNumber.i;

        // determine fractionSize if it is not specified; `+fractionSize` converts it to a number
        fractionSize = (isUndefined(fractionSize)) ? Math.min(Math.max(minFrac, fractionLen), maxFrac) : +fractionSize;

        // The index of the digit to where rounding is to occur
        var roundAt = fractionSize + parsedNumber.i;
        var digit = digits[roundAt];

        if (roundAt > 0) {
            digits.splice(roundAt);
        } else {
            // We rounded to zero so reset the parsedNumber
            parsedNumber.i = 1;
            digits.length = roundAt = fractionSize + 1;
            for (var i = 0; i < roundAt; i++) digits[i] = 0;
        }

        if (digit >= 5) digits[roundAt - 1]++;

        // Pad out with zeros to get the required fraction length
        for (; fractionLen < fractionSize; fractionLen++) digits.push(0);

        // Do any carrying, e.g. a digit was rounded up to 10
        var carry = digits.reduceRight(function (carry, d, i, digits) {
            d = d + carry;
            digits[i] = d % 10;
            return Math.floor(d / 10);
        },
            0);
        if (carry) {
            digits.unshift(carry);
            parsedNumber.i++;
        }
    }

    /**
     * Format a number into a string