Now we're going to learn about if statements. If statements are a fundamental part of learning
to program. They help a computer make decisions. All computers use if statements, including
my phone. For example, when I unlock my phone, it runs some code that says if I enter the
password correctly, then unlock the phone. Otherwise, it shows an error message.
You can use if statements in your code to make Steve and Alice react to what they see in
the world. For example, if there is a rock in front of them, they can turn left. Or turn
right if they run into a tree. In this case, we don't want to fall into the lava.
It's easy to plan for the lava. We can see it on the screen. But what about the lava that we
can't see under the stone? After we mine the stone, we'll need to check
if there's any lava in there before moving forward. If there is lava there, we want to
place a stone in front of our character before we move forward. That way we can safely move on.
Time for more mining! And remember to use the if statement to watch your step.