Why do Bootstrap functions start with a + sign?

javascript, twitter-bootstrap-3

Solution

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

Problem

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

Original source

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