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when I was writing code as below，it throw a error。

function(){}()

If I add '!' ,it will not .why?I'm confused。

!function(){}()

Jian Wang
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  • what's the extra parenthesis for? –  Mar 06 '15 at 01:50
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    Because the first is a *function declaration* without the mandatory name, the second is a *function expression* where the name is optional. – RobG Mar 06 '15 at 01:51

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