# Language - Comment

They should explain why, not what. They can optionally explain how if what’s written is particularly confusing.

## 3 - Example

// This is a single-line comment

/* But this
is a multiline
comment.
*/

var a = /* It can also appears in the middle of an expression */ 42;
console.log(a);

## 4 - Snippet

### 4.1 - Suppressing comments with regular expression

In javascript with the Replace function.

text = "// My beautiful comment\r\nmy beautiful code\r\n";
text = text.replace(/^[/]{2}[^\r\n]+[\r\n]+/mg, "");
console.log(text);

where:

• The regexp pattern can be read as:
• ^ - the start of the pattern
• [/]{2}: two backslashs
• [^\r\n]: All characters excepts the end of line \r\n. The ^ character is a negation in a class.
• + is a quantifier meaning one or more