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a351636bfa
The original excercise instructs the learner to use the vector macro. It is easy to assume that the code needs to read from `a` which is not what is intended. The updated excercise introduces the syntax for initial array and vector contents and lets the learner figure out how to tweak initial values of a vector. This learning seems to be the original intent of the excercise.
Vectors
Vectors are one of the most-used Rust data structures. In other programming languages, they'd simply be called Arrays, but since Rust operates on a bit of a lower level, an array in Rust is stored on the stack (meaning it can't grow or shrink, and the size needs to be known at compile time), and a Vector is stored in the heap (where these restrictions do not apply).
Vectors are a bit of a later chapter in the book, but we think that they're useful enough to talk about them a bit earlier. We shall be talking about the other useful data structure, hash maps, later.