Day 3: Logic

Lesson 4: If Else

Let's go back to our first example today:

<h1>Hello World<h1>

const happyCoder = true;

if(happyCoder === true) {
  console.log('Coder is happy');
}

if(happyCoder === false){
  console.log('Coder is not happy');
}

You may have thought at the time:

Isn't it a shame we had to write the case for true and false with if both times 🤷‍♂️

Well, if you did I have good news. if has a counterpart called else that can handle that false case in the example above. We can rewrite the above as:

<h1>Hello World<h1>

const happyCoder = true;

if(happyCoder) {
  console.log('Coder is happy');
} else {
  console.log('Coder is not happy');
}

I've also removed the === true since happyCoder is already a boolean.

The else { } block doesn't need a condition with ( ) because it will run when the if ( ) condition is false.

if statements don't need an else after them but else statements always need a preceding if - after all, there can't be an else unless there isn't an alternative to begin with!