Readability: Comments

- [Narrator] In this video, we're going to comments,…which are used for documenting and disabling…parts of your code.…The most important function for…comments probably is documentation.…That is, adding pieces of code that don't execute,…that can be read by other human beings…to understand what's going on in your program.…These come in two styles in JavaScript.…One is the line comment…which starts with two slash characters like this…and then anything after that on the same line…doesn't execute.…These can be at the beginning of a line like this,…or anywhere else.…

So if I wanted to document one of…these variable assignments for some reason,…I can put a line comment right here…towards the end of the line…and that works just fine.…This is not really documentation of the year.…It's clear enough from the variable name what it's doing…but this does work, is the point.…The other function of a JavaScript…comment is to disable parts.…so if I want say, this line, the day…not to execute anymore.…I can comment it out.…Let's copy this…