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Editorial Team
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Asked: 2026-06-13T19:41:29+00:00

Possible Duplicate: Getting a random value from a JavaScript array OK, so I have

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Possible Duplicate:
Getting a random value from a JavaScript array

OK, so I have three variables here, each being rock, paper or scissors. Using JavaScript, how can I generate one of those words randomly?

So far it’s like so:

<!DOCTYPE html>
<html>
    <body>
        <button type="button" onclick="myFunction()"> Click me</button>

        <script>
            function myFunction()
            {
                var c="Rock";
                var d="Paper";
                var e="Scissors";
            }
        </script>
    </body>
</html>

Then I’ll have a variable called K, which will be the random word out of rock paper or scissors. So it’ll be like so:

alert("The computer chose: " + k);

So how can I make JavaScript select randomly between the three variables, c, d and e?

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1 Answer

  1. Editorial Team

    Use:

    var things = ['Rock', 'Paper', 'Scissor'];
var thing = things[Math.floor(Math.random()*things.length)];
alert('The computer chose:' + thing);

    Demonstration

    Just to precisely answer your question, supposing you really want to keep your three global variables, you could do this:

    var c = "Rock";
var d = "Paper";
var e = "Scissors";
var thing = window['cde'.charAt(Math.floor(Math.random()*3))];
document.write('The computer chose: ' + thing);

    Demonstration

    (But don’t.)

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