Naming Variables

I've seen that type of naming before, usually strVariable or intVariable though, which makes it a little more clear what you are doing.

thanks, that's even better approach.

Generally, you want to keep variable names as descriptive about their purpose as you possibly can, just like how you want to keep the names of functions as clear as you possibly can. Take this JavaScript code, for example:

var oVariable = {
    sVariable: null,
    nVariable: null,
    aVariable: null,
    bVariable: null
};

Can you tell me what that object represents, or what any of its keys or values is supposed to represent? Sure, you could probably tell me what data types it'll hold, but those are very easy to figure out. You should use your code to convey the meaning of what it's intended to do with each line, because it's way harder to figure out what the code above does than code like this:

var me = {
    name: "Michael",
    age: 18,
    languages: ["English", "JavaScript", "Python", "Objective-C", "Swift"],
    treehouseModerator: true
};

That way, code is much easier to maintain in the future, both by people who haven't read your code before and are trying to understand and modify it, and by yourself months later after you've forgotten what's going on