Ash Blue Ash Blue - 6 months ago 20
Javascript Question

JavaScript Random Positive or Negative Number

I need to create a random -1 or 1 to multiply an already existing number by. Issue is my current random function generates a -1, 0, or 1. What is the most efficient way of doing this?

Answer

Don't use your existing function - just call Math.random(). If < 0.5 then -1, else 1:

var plusOrMinus = Math.random() < 0.5 ? -1 : 1;