Question

const d = 4
let a = 1
if (true) { 
  let a = 4
  var b = 2
  if (a < 5) {
    var c = 1
    b = 5
  }
}
console.log(a + b + c);

What is is the output and why?

a) The output is 7 because a, b and d are globally scoped variables

b) The output is 7 because b and c are globally scoped variables

Answer 1

The variable declared outside

of a function becomes GLOBAL.

The global variable has global scope: all scripts

and functions on the web page can be accessed.

for example, in the given code

const d = 4
let a = 1
if (true) { 
  let a = 4
  var b = 2
  if (a < 5) {
    var c = 1
    b = 5
  }
}
console.log(a + b + c);

The output is 7 because b and c are globally scoped variables.