The key to making your JavaScript slot machine game fair and fun is randomness. This is achieved by using a random number generator (RNG) to determine which symbols will appear on the reels.

While JavaScript might not be the ideal language to write a production compiler, you might enjoy the “Create Your Own Compiler” tutorial that does an annotated walkthrough of “The… ...

If you want to learn to create relatively simple online games using Javascript, then the HTML5 Game From Scratch Step By Step Learning JavaScript course is a great place to start.