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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!

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Accepted answers

JimBarry

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

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JimBarry

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.

<SPAN class="keyword token">var</SPAN> amount <SPAN class="operator token">=</SPAN> <SPAN class="number token">199.99</SPAN><SPAN class="punctuation token">;</SPAN>
<SPAN class="keyword token">var</SPAN> values <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">{</SPAN><SPAN class="string token">"Penny"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">0.01</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"Nickel"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">0.05</SPAN><SPAN class="punctuation token">,</SPAN>
                  <SPAN class="string token">"Dime"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">0.1</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"Quarter"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">0.25</SPAN><SPAN class="punctuation token">,</SPAN>
                  <SPAN class="string token">"One Dollar"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">1</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"Five Dollars"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">5</SPAN><SPAN class="punctuation token">,</SPAN>
                  <SPAN class="string token">"Ten Dollars"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">10</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"Twenty Dollars"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">20</SPAN><SPAN class="punctuation token">,</SPAN>
                  <SPAN class="string token">"Fifty Dollars"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">50</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">"One Hundred Dollars"</SPAN><SPAN class="punctuation token">:</SPAN> <SPAN class="number token">100</SPAN><SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">;</SPAN>

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

<SPAN class="keyword token">return</SPAN> result<SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

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<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

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!

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