When the function has one expression, a good practice is to inline the arrow function. 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. The first is called a single line comment and, as implied, only applies to a single line in the "source code" (the program). 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 … The amount of time required to go back and figure out how something works is much larger after you’ve already built the function. At a minimum, provide a helpful synopsis, description, parameter (for all), and example Commenting is best done before actually writing the code for your program. DESCRIPTION Particularly when the comment must be frequently edited, as with the help and documentation for a function or script. An inline comment is a comment on the same line as a statement. Comments are specially marked lines of text in the program that are not evaluated. Don’t build in everything but the kitchen sink. Undefined values can break your code. ... Use the built in comment-based help system. There cannot be more than one blank line between the last line of the function help and the function keyword. This would be the best time to leave open and honest comments about your code. /* */ is much safer to use because it doesn’t cause errors when the line break is removed. Comment what you consider needed - but don’t tell others your life story. It is a good habit to assign default values to arguments. Additionally this will give you practice to getting used to commenting all of your files. Comment & Description; 1 /* text */ The compiler ignores everything from /* to */. The JDK javadoc tool uses doc comments when preparing automatically generated documentation. It is a good coding practice to put all declarations at the top of each script or function. 3 /** documentation */ This is a documentation comment and in general its called doc comment. Note that comments are just as much a part of the code as the program itself. Single-line comments are referred to as inline comments when they appear at the end of a line of code. Avoid using the line comment //. Outdated comments can be more of a detriment than no comment at all, so remember to maintain and update comments regularly along with everything else. Suggested Best Practices Write your function with one purpose. Inline Comments. Before the function keyword. They should start with a # and a single space. For example: Inline comments should be separated by at least two spaces from the statement. Fat arrow and comparison operators. Use the built in comment-based help system. ... for example it can't check if you have used misleading english to describe the purpose of a function! Write your function with one purpose. If a function is called with a missing argument, the value of the missing argument is set to undefined. Ask Question Asked 8 years, 11 months ago. 2 //text. Inline comments are unnecessary and in fact distracting if they state the … At the end of the function body. There are usually two syntactic ways to comment. Best practices in comment writing and documentation . When these comparison operators are used in an inline arrow function, it creates some confusion. The comments I added at the function definition can be previewed whenever I use that function, even from other files. 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. The compiler ignores everything from // to the end of the line. Syntax for comment-based help in functions. If you debug using comments, there is a nice little trick: 3. Comment-based help for a function can appear in one of three locations: At the beginning of the function body. The comparison operators >, <, <= and >= look similar to the fat arrow => (which defines the arrow function).

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