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return !1 in javascript
In a JavaScript file I had to read today, there was a line where a variable was declared like a factorial, like this :
var myVariable = !1;
and then something similar was used as parameter in a function like this :
return variable.myFunction(!0);
Can anyone explain me what the exclamation mark means in this context and eventually, why this is generally used for (benefits) ?
Thank you in advance !