JavaScript plus sign in front of function expression

I’ve been looking for information about immediately invoked functions, and somewhere I stumbled on this notation:
+function(){console.log("Something.")}()
Can someone explain to me what the + sign in front of the function means/does?

[@dunkyl]

Syntactically, it prevents the function from being a statement instead of an expression. As compared to using parentheses, it is just one character shorter.

[@user-ws4ue5rf8c]

❤😮

[@Brunoenribeiro]

Interesting, but please, never add this to a professional codebase. You will only make your colleages' life a bit more miserable when they lose time trying to understand this obscure exploit of the language.