KLagdani

//sayHi is hoisted during the creation of the context execution
sayHi("Bulma"); //calls the function and prints "Bulma says hi"
function sayHi(who) {
 console.log(who + " says hi");
}

KLagdani

//myConst is hoisted during the creation of the context execution
//It exists in memory with undefined as a value
//But we are not allowed to access it before declaring it
myConst = "I am a const"; //Throws: Cannot access 'myConst' before initialization
console.log(myConst); //line not reached due to error thrown above
const myConst = "Initializer";

KLagdani

//myLet is hoisted during the creation of the context execution
//It exists in memory with undefined as a value
//But we are not allowed to access it before declaring it
myLet = "I am a let"; //Throws: Cannot access 'myLet' before initialization 
console.log(myLet); 
let myLet;

KLagdani

//myVar is hoisted during the creation of the context execution
//It exists in memory with undefined as a value
myVar = "I am a var"; //Perfectly ok
console.log(myVar); //Prints "I am a var"
var myVar;
 
//OR
console.log(myVar); //Perfectly ok, prints "undefined"
var myVar;