How do you guys write comments on some simple code that you use just for yourself? 

I mostly write JavaScript and PHP code, and I can't really feel like I found a nice way to write comments.

If I have a short line of code, I usually do this:

```
x = doThis(getSomeValueFromSomewhere());  // This is a short line of code

```

Which seems really nice I think, but it doesnt really works when the line gets a little longer or on multiple lines, 

```
 // Dont really like this since it's not clear if it describes only line 1, or all lines.
 aLongerVariableName = (getSomeValueFromSomewhere() == "this is what I want") ? "true value" : "false value";
 x = doThis(aLongerVariableName); 

```

So, how do you do it?