How to invoke an IIFE without any extra brackets?
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Immediately Invoked Function Expressions(IIFE) requires a pair of parenthesis to wrap the function which contains set of statements.
(function (dt) {
console.log(dt.toLocaleTimeString());
})(new Date());
Since both IIFE and void operator discard the result of an expression, you can avoid the extra brackets using void operator for IIFE as below,
void function (dt) {
console.log(dt.toLocaleTimeString());
}(new Date());