excersise.txt

1. With the following code blocks, can you say what will happen in each of these instances?

// what breaks below?
const c1 = 1;
c1 = 3;

// Or updating a string…
const c2 = "hello";
c2 += " world!";

// Or reassigning an object…
const c3 = {};
c3.name = "Geoff";
c3.someValue = "Sausage";
c3 = {};


2. What will be the output for this hoisting example.
 
var n = 1;

function print() {
    console.log("print():1:",n);
    var n = 2;
    n++;
    console.log("print():2:",n);
}

console.log("inline 1: ", n);
print();
console.log("inline 2: ", n);

3. What is the output of folowing block scope

let callbacks = []
for (let i = 0; i <= 2; i++) {
  callbacks[i] = function () { return i * 2 }
}

// note the var declaration of the loop iterator
for (var j = callbacks.length; j < 5; j++) {
  callbacks[j] = function () { return j * 2 }
}

console.log( callbacks[0]() );
console.log( callbacks[1]() );
console.log( callbacks[2]() );
console.log( callbacks[3]() );
console.log( callbacks[4]() );