specialvalues_line_of.mdx

id	keywords	name	summary	category
line-of	line of	__LINE_OF__	This is the `__LINE_OF__` special value.	specialvalues

__LINE_OF__(expression) returns a tuple consisting of (line, expression), where line is the line number at which the expression you pass as a parameter here appears in the file.

Note: expression refers to any expression, it does not need to be a function.

<CodeTab labels={["ReScript", "JS Output"]}>

letf= () =>Nonelet (line, f') =__LINE_OF__(f) line->Console.logf'->Console.log

functionf(){}console.log(2);console.log(f);varline=2;varf$p=f;