Percentage chance of saying something?

Question

How do I make it so ..

• 80% of the time it will say sendMessage(\"hi\");
• 5 % of the time it will say sendMessage(\"bye\");
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Answer 1

Yes, Math.random() is an excellent way to accomplish this. What you want to do is compute a single random number, and then make decisions based on that:

var d = Math.random();
if (d < 0.5)
    // 50% chance of being here
else if (d < 0.7)
    // 20% chance of being here
else
    // 30% chance of being here

That way you don't miss any possibilities.