Update and re-declare of let and const

re-declarations-let-const.js

// This is OK - updating apples
let apples = "3 apples";
apples = "4 apples";

// This is NOT OK - re-declare pears
let pears = "3 pears";
let pears = "4 pears"; // error: Identifier 'pears' has already been declared

// This is OK - different scopes, same variable name
let bananas = "3 bananas";
if( true ){
  let bananas = "4 bananas";
  console.log(bananas); // "4 bananas"
}
console.log(bananas); // "3 bananas"

// CONST part

// This is NOT OK - updating const
const appleConst = "3 apples";
applesConst = "4 apples"; // error: Assignment to constant variable. 

// This is NOT OK - re-declare const
const pearsConst = "3 pears";
const pearsConst = "4 pears"; // error: Identifier 'pearsConst' has already been declared

// This is OK - update property of CONST object
const showMe = {
  what: "apples",
  howMany: 3
};

showMe.howMany = 4;
console.log(showMe.howMany + ' ' + showMe.what); // "4 apples" - property howMany was updated