Hoisting JS

oh well I was quite surprised to know this feature of javascript called Hoisting and I am sure not many knew this

so what is javascript hoisting ?

Example:-1
x = 5; // Assign 5 to x

elem = document.getElementById("demo"); // Find an element
elem.innerHTML = x;                     // Display x in the element

var x; // Declare x

so what is wrong with above code ? wait !!

In JavaScript, a variable can be declared after it has been used.

In other words; a variable can be used before it has been declared.

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