NEA - scope.md

Scopes Discussion

1. What is the scope of variable GLOBAL_DATA in the example below:

<script>
  let GLOBAL_DATA = { value : 1};
</script>

Pretend in the console, that we type: console.log(GLOBAL_DATA);

2. What is the scope of variable x in the examples below:

let x = 1;
{ 
  let x = 2;
}
console.log(x);
var x = 1;
{ 
  var x = 2;
}
console.log(x);

3. What is the scope of variable x in the examples below:

function outerFn(){
    let x = 1;
    function log(){
      console.log(x);
    };
    function run(fn){
      let x = 100;
      fn();
    }
    run(log);
};
outerFn();

4. What do we call this method of scoping:

let x0 = 0;
function fn1(){
  let x1 = 1;
  fn2();
  function fn2(){
    let x2 = 2;
    fn3();
    function fn3(){
      let x3 = 3;
      console.log(x0 + " " + x1 + " " + x2 + " " + x3);
    };
  };
};
fn1();

5. What is the difference between global scope and other scope types and when do we use the global scope?

6. What is the difference between let and var defining a variable?

7. What is the difference between strict mode and sloppy mode?

1. it's in the global scope.
2. the global scope.
3. x=1 is inner scope because it's inside the outerFn function, x=100 is inner scope because it's inside run function
4. lexical scoping
5. the global scope is like the main room, and inside of that room there's a boxes which is the inner scopes, that inner scope connot be accessed by the global scope.

team room 9

Ahmed Isam | Papula Ali | Dilan Ahmed | Muhammad Sabah | Ara Kardo.

1. it is a Global Scope.

2. The scope for Variable X in both Let and Var deceleration are global scope and the console log will bring the variables outside the {} blocks but there is a little detail here. the first console log will print the first let variable value which is 1 , for the VAR it will print 2 as the var is a global declared variable itself and can be re assigned . Also another thing here is, when you console log it it gives an Error as the same variable name is declared twice once by let and the other by var which causes the Error .

3. is a functional scope and will bring back 1.

4.It is called lexical scoping, also known as static scoping. In lexical scoping, the scope of a variable is determined by its position within the source code

5. The global scope can be accessed globally in the code, but the other type of scoping can only be accessed within the range of its scope .

6. let can not be re declared but can be re assigned. On the other hand Var is a global declared variable and can be re declared and re assigned.

Group: Zainab Alnajjar | Aya Hasan | Barham Baper | Kanyaw Yousif | Ninos Dinkha

1. global scope
2. global scope when using let, error when using var (it have scope problems)
3. the main function scope (x=1)

1. global scope
2. will print out 1 and 2
3. its a function scope and will print out 1
4. Its called a lexical scoping
5. a global scope is when we can access a variable everywhere in our program but in a local scope it can only be accessed within a specific scope and cant be accessed from the outside. we use global scope when we need to access a variable everywhere.