Скачать или смотреть Hoisting Trap in JS⚠️ | What’s the Log? 92

Inside the function, var x is hoisted, meaning it is moved to the top of its scope but without its value.

So the function fun() is interpreted like:

function fun() {
var x; // hoisted (initially undefined)
console.log(x); // → undefined
x = 5;
console.log(x); // → 5
}


The outer x = 10 is not used inside the function because the local var x shadows it.

So final output is:

undefined
5
10

Key Takeaways
✅ var is hoisted with value undefined
✅ Local variable shadows global variable
✅ Always know where your variable actually lives in scope

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