Why do Bootstrap functions start with a + sign?

Question

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

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The answer also seems to be located here: https://stackoverflow.com/questions/5827290/javascript-function-leading-bang-syntax — Corey Ogburn, Dec 03 '13 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... — dandavis, Dec 03 '13 at 18:37

score 10 · Accepted Answer · edited May 23 '17 at 10:29

10

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

edited May 23 '17 at 10:29

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answered Dec 03 '13 at 18:26

Rahul Tripathi

1 Answers1