BlockScopeVariables.js

//=============================================================================
// Block Scoped Variables                                                             
//=============================================================================


//Variable Types
//var 
//let

//ES5
function blockScope1() {
  
  //Not considered a block scope for var
  {
    var a = 1;
  }

  function blockScope() {
    var b = 0;
    console.log("Block Scope 1: " + b); //Block Scope 1: 0
  }

  blockScope2();

  console.log("Block Scope 1 :" + a); //Block Scope 1: 1
  console.log("Block Scope 1: " + b); //b is not defined
}

blockScope1();

//ES6
function blockScope2() {
  
  {
    let a = 0;
    console.log(`Block Scope 2 : ${a}`); //Block Scope 2 : 0
  }

  console.log(`Block Scope 2 : ${a}`);//a is not defined
}

blockScope2();