what does `!function()` mean?

2018-07-04 19:15:46

This question already has an answer here:

What does the exclamation mark do before the function? 9 answers

The preceding ! takes the un-parseable statement, and allows it to to be parsed by the JS engine, which in turn returns true.

function(){}();
SyntaxError: Unexpected token (

!function(){}();
>>true

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