Will the input() function execution context be inside the check() function execution context?

Question

My question is about the execution context in this code: when the function check() got called using the console.log will the input() function execution context be inside the check() function execution context or outside of it .

var x;
var y;
function check(){
y = input()
  if(y<10){
    return "true";
  }
  else{
    return false;
  }
}

function input(){
  x = eval(prompt("please enter a number "));
  return x;
}

console.log(check());

I tried just to make the variable deceleration outside of the function and assign them inside the function.

The result that i got when i added input as (9) i got true and that is correct.the question is about the context only.

Answer 1

It's not "inside". Execution contexts are one on top of the other on a stack.

You have the Global Execution Context at the bottom. When you call check() , its execution context is pushed on top of the stack.

check()
-------
Global

When inside check you call input() , the new execution context will be again pushed on top:

input()
-------
check()
-------
Global

When input returns a value, its context is popped out of the array, and execution of check resumes. When check returns, its context is popped out too.

Both functions have access to variables x and y through the scope chain.