Chapter 3. Variables and expressions: giving names and values to things
4.1. Giving names to things
4.1.1. Math vs. programming
4.1.2. What the computer can and can’t do
4.2. Introducing variables
4.2.1. Objects are things that can be manipulated
4.2.2. Objects have names
4.2.3. What object names are allowed?
4.2.4. Creating a variable
4.2.5. Updating a variable
