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I noticed a + sign preceeding a function in the bootstrap.js code and wondered what effect this has or is it just for fun?

twitter bootstrap

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    Ugh... pictures of text. Mind if I edit it to just text? Commented Dec 3, 2013 at 18:25
  • @CoreyOgburn no need, it's a duuuuuuupe. Commented Dec 3, 2013 at 18:26
  • The answer also seems to be located here: stackoverflow.com/questions/5827290/… Commented Dec 3, 2013 at 18:26
  • the plus operator coerces the expression to its right into a number. if there is a "([args])" after the function statement, then the whole thing becomes an expression (instead of a syntax error). the function is then executed to return a value that it then attempts to coerce into a number. if that doesn't work, no error is shown, so it "works" fine. a paren is much more readable... Commented Dec 3, 2013 at 18:37

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I think it forces the parser to treat the part following the + as an expression. You can also read Immediately-Invoked Function Expression

Also check JavaScript plus sign in front of function name

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