// var → function
// let → block
// const → block
      

var Keyword Example

function sayHello(){
  for(var i=0;i<5;i++){
    console.log(i);
  }
  console.log(i); // :O
}
sayHello();
      

let Keyword Example

function sayHello(){
  for(let i=0;i<5;i++){
    console.log(i);
  }
  console.log(i);
}
sayHello();
      

const Keyword Example

const x = 1;
x = 2; // :O
      

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