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Commenting involves placing Human Readable Descriptions inside of computer programs detailing what the Code is doing. Proper use of commenting can make code maintenance much easier, as well as helping make finding bugs faster. Further, commenting is very important when writing functions that other people will use. Remember, well documented code is as important as correctly working code.

While it's easy to measure the quantity of comments in a program, it's hard to measure the quality, and the two are not necessarily correlated. A bad comment is worse than no comment at all.

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Comments should not duplicate the code (D.R.Y)

Your comments should be D.R.Y. The acronym stands for the programming maxim “Don’t Repeat Yourself.” This means that your code should have little to no redundancy. You don’t need to comment a piece of code that sufficiently explains itself. For example:

return a # Returns a

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If you can’t write a clear comment, there may be a problem with the code

The most infamous comment in the Unix source code is “You are not expected to understand this,” which appeared before some hairy context-switching code. It turned out that Dennis Ritchie and co-author Ken Thompson didn’t understand it themselves and later had to rewrite it.

Warning readers ...

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Good comments do not excuse unclear code

A misuse of comments is to provide information that should have been in the code. An example is when someone names variables badly and then tries to add comments describing them:

# A dictionary of families who live in each city

mydict = {

"Midtow...

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Provide links to the original source of copied code

Most programmers use code that they find online. Including a reference to the source enables future readers to get the full context, such as:

  • what problem was being solved
  • who provided the code
  • why the solution is recommended
  • what commenters thought of it

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"Programs must be written for people to read and only incidentally for machines to execute."

HAL ABELSON

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Explain unidiomatic code in comments

It’s a good idea to comment code that someone else might consider unneeded or redundant, such as this code:

final Object value = (new JSONTokener(jsonString)).nextValue();

// Note that JSONTokener.nextValue() may return

// a value equals() to nu...

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Add comments when fixing bugs

Comments should be added not just when initially writing code but also when modifying it, especially fixing bugs. Consider this comment:

// NOTE: At least in Firefox 2, if the user drags outside of the browser window,

// mouse-move (and even mouse-down) events will ...

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Commenting

All programs should be commented in such a manner as to easily describe (in English) the purpose of the code and any algorithms used to accomplish the purpose. A developer should be able to utilize a previously written program (or function) without ever having to look at the code, simply by readi...

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Use comments to mark incomplete implementations

Sometimes it’s necessary to check in code even though it has known limitations. While it can be tempting not to share known deficiencies in one’s code, it is better to make these explicit, such as with a TODO comment:

// TODO: We are making the decimal separator be a period,

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