Random Numbers
Generating Random Numbers
JavaScript has a fun function called Math.random(). It will generate some crazy decimal between 0 and 1. That’s cool, but what if we want to get a number between 1 and 3?
Elementary! Multiply it by three!
Hmm… That’s still not getting us all the way there. Here are a few numbers that I generated.
- 0.983854177263559
- 1.2686074516508812
- 2.8046332459732235
- 2.249551404129546
- 2.573826382472637
- 2.224357980788116
- 1.2507436439851465
- 1.9703391399107906
- 2.48614382491825
They are between 0 and just under 3. We need to add one and then round down. Math.floor() will round the number down.
Math.floor(2.48614382491825) === 2; // true!
So, what happens if we do Math.floor(Math.random() * 3 + 1)?
- 2
- 3
- 1
- 2
- 3
- 1
- 3
- 2
We did it! 🎉
More here: MDN Docs Math.random()
