How can I randomize a number within a range and make every number have equal probability

Asked May 31 '21 at 14:30

Active May 31 '21 at 14:30

Viewed 22 times

I was trying to make a randomizing array, but the thing is that the number 2 is chosen a lot (and it makes it Array[2]), here is my current code (it's rps):

const rps = ['Rock', 'Paper', 'Scissors']; 
//the next few lines are irrelevant
const chosen = rps[Math.round(Math.random()*3)-1] //usually returns Scissors

My goal is to find a way to randomize to have each of the choices with around 33% chance of being chosen (since 3 choices, 33.3%)

asked May 31 '21 at 14:30

MrMythical

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`rps[Math.floor(Math.random() * rps.length)]` – Barmar May 31 '21 at 14:33
Use `Math.floor(Math.random() * 3)` instead – May 31 '21 at 14:33
Your code also tries to access `rps[-1]`, which doesn't exist. – Barmar May 31 '21 at 14:34
Interestingly, [`rps.at(Math.round(Math.random() * 3) - 1)`](//github.com/tc39/proposal-relative-indexing-method) would work just fine. – Sebastian Simon May 31 '21 at 14:36
It didn't, it said rps.at is not a function, but I found a way to get them all around the same probability, I will post my answer Edit: nvm the question got closed – MrMythical May 31 '21 at 14:39
Here's a distribution of the results: https://jsfiddle.net/uorg7xcq/ – May 31 '21 at 14:51

How can I randomize a number within a range and make every number have equal probability

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