Chapter 03

&self

The &self is actually short for 'self: &Self'

Shadowing

• Shadowing is different from marking a variable as mut because we’ll get a compile-time error if we accidentally try to reassign to this variable without using the let keyword.

• The other difference between mut and shadowing is that because we’re effectively creating a new variable when we use the let keyword again, "we can change the type of the value but reuse the same name"

Array

Auto fill array

let a: [i32; 5] = [1, 2, 3, 4, 5];

let a = [3; 5]; <===> let a = [3, 3, 3, 3, 3];

Iterators: iterators produce a series of values, and we can call the collect method on an iterator to turn it into a collection.