var a;
console.log(a);
+function() {
alert("Hello from IIFE!");
}();
console.log(a);
a = 'Hi';Output in console: undefined ALERT POPUP Hi
Question: Should both instances of variable 'a' display undefined or should they both show 'Hi?
Exploring how JavaScript functions in various scenarios
a starts as undefined.undefined gets printed to the console."Hello from IIFE!".undefined again.'Hi' to a.If you try this out in your browser's developer tools, you'll notice a similar pattern but with a slight variation. In a fresh console session, the output will be:
undefinedundefined'Hi'The final 'Hi' that you see is actually the return value when assigning a value to a variable.
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