Sometimes when you're coding, you find yourself toggling a block of code on or off by commenting it. Most development environments make this pretty easy with a button or shortcut that will comment or uncomment a selected block.

However, it can be handy to know that there's a way to achieve the same thing by setting up your block comments in such a way that they can be enabled or disabled by adding or removing a single "/".

Here's how it looks with the code commented out: 

/*
thisIsCodeIWant.toToggle(onOff);
andMoreCodeHere();
//*/

You can uncomment the code block by adding a "/" at the start of the block comment like so: 

//*
thisIsCodeIWant.toToggle(onOff);
andMoreCodeHere();
//*/

After I posted this, hbb reminded me of a related commenting trick. With the following set-up you can toggle between two code blocks by adding a "/". 

//*
thisIsCodeBlock(1);
moreCode();
/*/
thisIsCodeBlock(2);
andMore();
//*/

Just remove the "/" at the beginning of the first block comment to swap code blocks. 

/*
thisIsCodeBlock(1);
moreCode();
/*/
thisIsCodeBlock(2);
andMore();
//*/

This is a pretty basic tip, but I've found that not all developers are aware of it, so I thought it couldn't hurt to share it.