In any programming language, comments play a vital role in making the code understandable and easier to read. Comments are ignored by the compiler and are meant to provide additional information about the code. In Swift, there are two types of comments: single-line comments and multi-line comments.
Single-line comments are used to comment on a single line. They begin with
// and continue to the end of the line. Anything after
// is considered a comment and is ignored by the compiler.
1// This is a single-line comment 2 3print("Hello, world!") // This line will print "Hello, world!" to the console
Multi-line comments are used to comment on multiple lines. They begin with
/* and end with
*/. Anything between
*/ is considered a comment and is ignored by the compiler.
1/* 2This is a multi-line comment 3It can span multiple lines 4*/ 5 6print("Hello, world!") /* This line will print "Hello, world!" to the console */
It is also possible to nest multi-line comments, although this is not recommended.
1/* This is a multi-line comment 2 /* This is a nested comment */ 3 This is still part of the original comment 4*/
It is best practice to use comments to explain what the code does rather than how the code does it.
In conclusion, comments are an essential aspect of programming. They allow for better understanding of the code, both for the programmer writing the code and for other developers who may work with the code in the future.