function comment best practice

The JDK javadoc tool uses doc comments when preparing automatically generated documentation. There cannot be more than one blank line between the last line of the function help and the function keyword. Note that comments are just as much a part of the code as the program itself. Comments are specially marked lines of text in the program that are not evaluated. Fat arrow and comparison operators. Best practices in comment writing and documentation . Inline Comments. Don’t build in everything but the kitchen sink. Inline comments are unnecessary and in fact distracting if they state the … Comment what you consider needed - but don’t tell others your life story. Syntax for comment-based help in functions. When these comparison operators are used in an inline arrow function, it creates some confusion. The amount of time required to go back and figure out how something works is much larger after you’ve already built the function. The comparison operators >, <, <= and >= look similar to the fat arrow => (which defines the arrow function). There are usually two syntactic ways to comment. It is a good coding practice to put all declarations at the top of each script or function. Inline comments should be separated by at least two spaces from the statement. 3 /** documentation */ This is a documentation comment and in general its called doc comment. Undefined values can break your code. Use the built in comment-based help system. 3. This would be the best time to leave open and honest comments about your code. Suggested Best Practices Write your function with one purpose. At a minimum, provide a helpful synopsis, description, parameter (for all), and example Write your function with one purpose. /* */ is much safer to use because it doesn’t cause errors when the line break is removed. Avoid using the line comment //. The compiler ignores everything from // to the end of the line. If a function is called with a missing argument, the value of the missing argument is set to undefined. Here is another example where I call a function from a third party library: In these particular examples, the type of commenting (or documentation) used is … 2 //text. When the function has one expression, a good practice is to inline the arrow function. Additionally this will give you practice to getting used to commenting all of your files. The first is called a single line comment and, as implied, only applies to a single line in the "source code" (the program). An inline comment is a comment on the same line as a statement. Comment-based help for a function can appear in one of three locations: At the beginning of the function body. It is a good habit to assign default values to arguments. Before the function keyword. Commenting is best done before actually writing the code for your program. ... for example it can't check if you have used misleading english to describe the purpose of a function! Inline comments Comments on the same line as a statement can be distracting, but when they don't state the obvious, and particularly when you have several short lines of code which need explaining, they can be useful. DESCRIPTION Particularly when the comment must be frequently edited, as with the help and documentation for a function or script. The comments I added at the function definition can be previewed whenever I use that function, even from other files. Outdated comments can be more of a detriment than no comment at all, so remember to maintain and update comments regularly along with everything else. This is a general programming best practice — making sure that you create functions that fulfill one job at a time makes it easy for other developers to debug and change your code without having to scan through all the code to work out what code block performs what function. Ask Question Asked 8 years, 11 months ago. For example: They should start with a # and a single space. ... Use the built in comment-based help system. If you debug using comments, there is a nice little trick: Comment & Description; 1 /* text */ The compiler ignores everything from /* to */. At the end of the function body. Single-line comments are referred to as inline comments when they appear at the end of a line of code.

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