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Exercises

Recap questions​

What is the syntax for including notes and explanations in our code?

You can instruct the machine to ignore the rest of the line by writing a double slash:

// this is a function
function greet() {
  console.log('Hello Sally Brown');
}

greet(); // this is how to call it

You can comment the whole line, or just the text after the slashes.

Exercises​

What does the following code do?​

function greetSally() {
  console.log('Hello Sally Brown');
}

function greetCharlie() {
  console.log('Hello Charlie Brown');
}

function greetFriends() {
  console.log('Hello Sally Brown');
  console.log('Hello Charlie Brown');
}

greetCharlie();
greetFriends();
Toggle Console Output
  • 'Hello Charlie Brown'
  • 'Hello Sally Brown'
  • 'Hello Charlie Brown'
Without opening the results, what is the output of the code above?
  • First we call greetCharlie, that will print 'Hello Charlie Brown';
  • Then we call greetFriends, printing the remaining two logs.
Bonus: the code above can be written using just two instances of console.log, can you guess how?
function greetSally() {
  console.log('Hello Sally Brown');
}

function greetCharlie() {
  console.log('Hello Charlie Brown');
}

function greetFriends() {
  greetSally();
  greetCharlie();
}

greetCharlie();
greetFriends();

We haven't mentioned it explicitly yet, but you can call functions from inside functions! That will be the rule pretty soon. We'll get there together, don't fret!