What happens when JavaScript executes my code ?

In order to explain how it works we need to take snippet of code :-

As soon as we start running our code, it creates a global execution context which leads to : -

Now a question arise in your mind is what the hack is “Execution context” and why we care about it ? So here is my understanding , Execution context is an abstract concept used by ECMAScript specification to track the runtime evolution of the code. Still confused ???now take an example of code snippet given above.

Whenever you execute a function in JavaScript, it creates a new execution context comprising execution thread and a local memory where anything defined in a function is stored.

2. It will call the function which is in the local scope and creates a local execution context

Now after global execution stack is created it called the function and create one more stack as local execution context stack which firstly executes the local scope as given below in the fig.

After the execution of local scope it returns the value 16 and stored in res variable and return back to the function.

Now its time to execute global scope from call stack and after the execution we got function value as 16 and the global scope stack is also destroyed and hence the execution over.

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