Null is popping up when it shouldn’t be

New JavaScript coder here, self taught. Learning for fun and very confused along the way.

Anyway when I check my code on the browser, “null” comes up for “computerSelection”. Here is my code:

    let choices = ["Rock", "Paper", "Scissors"];

    function getComputerChoice(){
    let choice = choices[Math.floor(Math.random())];
    let computerSelection = (choices[choice]);
    return computerSelection
    }

How do I go about doing this properly so that it works?

I tried programming it in the way I thought was correct with variables in the function and I expected it to return a choice of rock, paper or scissors. Instead, all I get is “null” :/