Alright, so we gotta talk about mutability. Mutability refers to the ability of an object's value to be changed after it's creation. If you can change it, it's considered mutable. If you cannot alter it after its creation, it is considered immutable. So, by default, when we use variables and
Possibly-uninitialized? But we did. We DID. We didn't. We declared a type, but we didn't give it a value. It's like the sound of one hand clapping. We can't use it. Lucky Number Seven.
With this file, we're starting to look at data types. It's not happy with line 7, where we tell it that we are going to be using a variable, x. It says, consider giving x a type, but let's be honest, when it says consider, it really means you have
We're going to presume that you're in your rustlings directory and you've typed in rustlings watch to get thing started. When we are using rustlings watch we have started a program that will continually look at the directory in order and tell you what to do and what's going on.
Learn to set up Rustlings