Arcade: finding the modulus?

[JimBarry]

Seems Arcade doesn't yet have a math function, like, say:  Mod(value, modulo) -> Number

Anyone have a creative function for calculating one using the existing math functions?

Thanks!

[JimBarry · Accepted solution]

User error.  Arcade doesn't need a Mod() function. It already has a "%" Modulus operator.

[XanderBakker]

Hi  Jim Barry ,

Nice to see you are doing some Arcade! Normally there are several ways that lead to Rome. Here is an example to play around with. 

var amount = 199.99;
var values = {"Penny": 0.01, "Nickel": 0.05,
                  "Dime": 0.1, "Quarter": 0.25,
                  "One Dollar": 1, "Five Dollars": 5,
                  "Ten Dollars": 10, "Twenty Dollars": 20,
                  "Fifty Dollars": 50, "One Hundred Dollars": 100};

var currencies = Reverse(["Penny", "Nickel", "Dime", "Quarter", 
                  "One Dollar", "Five Dollars", "Ten Dollars", 
                  "Twenty Dollars", "Fifty Dollars", "One Hundred Dollars"]);
var result = "Pay $ " + amount + ":";
for (var i in currencies) {
    var value = values[currencies[i]];
    if (i == Count(currencies)-1){
        var coinsbills = Round(amount / value, 0);
    } else {
        var coinsbills = Floor(amount / value, 0);    
    }
    if (coinsbills > 0) {
        result += TextFormatting.NewLine + "  " + coinsbills + " " + currencies[i];
        // amount -= coinsbills * value;
        amount = Round(amount, 3) % (coinsbills * value);
    }
}

return result;‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

This will return:

Pay $ 199.99:
  1 One Hundred Dollars
  1 Fifty Dollars
  2 Twenty Dollars
  1 Five Dollars
  4 One Dollar
  3 Quarter
  2 Dime
  4 Penny‍‍‍‍‍‍‍‍‍

As you can see on line 21 and 22 you can use either way. 

Edit: changed code to resolve a nasty error due to rounding. 

[JimBarry]

Hi Xander!!

Oh, that's neat. Thanks for the script. Nice use of modulus, and creative example of doing the same without it.

Here's a slide deck I used, giving an Intro to Arcade 30-min session at the Mid-Atlantic User Conference a few weeks ago: Arcade: an Introduction - Esri MUC 2019 

[XanderBakker]

Hi jbarry-esristaff ,

Thanks for sharing the slide deck. Very cool!