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Arcade : Generate Random # Between X and Y

BrianO_keefe

Arcade is excellent. I'm digging in and using it alot. But one of the things I am finding a need for is to generate random numbers. I build a lot of demo maps with fake data. I have to generate fake budgets, fake dates, etc. I generally just 'lorem ipsum' for descriptions but I need to be able to better generate more (close to) realistic numbers.

Does anyone know how I could do this with Arcade?

My preference would be Random(x) to get a number between 0 and X. But that isn't to be.

Anyone?

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Accepted answers

XanderBakker

Since Random (Math Functions | ArcGIS for Developers ) returns a value between 0 and 1 you just multiply with the value you want to use as upper boundary:

<SPAN class="token function">Random</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">*</SPAN> X<SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

If you want a value between A and B, you can do this:

<SPAN class="token function">Random</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">*</SPAN> <SPAN class="punctuation token">(</SPAN>B <SPAN class="operator token">-</SPAN> A<SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">+</SPAN> A<SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

All comments

DylanKennard-tt

1/28/2025 - If anyone comes across this and wants to do this in AGOL Smart Forms below is a method to make more of a string. Sort of like a hexcode value. Due to Arcade and not being pure JavaScript its a bit difficult to develop so going basic and simple like the below helps for numbers, letters, or numbers and letters.

///FL = Field Location
var prefix = 'FL';
var letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';

var num1 = Text(Floor(Random() * 10));
var num2 = Text(Floor(Random() * 10));
var num3 = Text(Floor(Random() * 10));

var letter1 = Mid(letters, Floor(Random() * 26) + 1, 1);
var letter2 = Mid(letters, Floor(Random() * 26) + 1, 1);
var letter3 = Mid(letters, Floor(Random() * 26) + 1, 1);

return prefix + num1 + num2 + num3 + letter1 + letter2 + letter3

anonymous55

Hello @Sarah_Saint-Ruth @XanderBakker

I need to create new field with unique ID for hosted layer which already published in AGOL. I can't find any Arcade code for creating unique ID for new field in AGOL . I am thinking about to copy object id to new field but I don't know the arcade code for it.

I will appreciate any help

Sarah_Saint-Ruth

You can use Round() and set it to 0 to return whole numbers i.e. Round(x,0)

adam_gallaher

This works, but how can one get it to work by generating whole numbers? Currently, this is set up to produce floats or doubles.

XanderBakker

Since Random (Math Functions | ArcGIS for Developers ) returns a value between 0 and 1 you just multiply with the value you want to use as upper boundary:

<SPAN class="token function">Random</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">*</SPAN> X<SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

If you want a value between A and B, you can do this:

<SPAN class="token function">Random</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">*</SPAN> <SPAN class="punctuation token">(</SPAN>B <SPAN class="operator token">-</SPAN> A<SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">+</SPAN> A<SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

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