Hoisting

Javascript pre-assumes that the declaration is on the top of current scope.

Let's say if we have defined a function in the bottom of our scope of script or function, even javascript interprter runs line by line , everyone can use this function before declaration . But keep in mind we will declare it later after using it , otherwise it will never work

Output

This will print hello , no matter you decalre it before calling or after calling.

var

Output

In short , we can say Hoisting is a behaviour which moves the declarations on the top while interpreting its code.

Above code will return ReferenceError

Do it yourself with var keyword and arrow functions.

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