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Book

The stack holds data associated with a specific function, while the heap holds data that can outlive a function.
A String is an owned value; a string slice (&str) is a borrowed value: https://youtu.be/n7-vKRLw3zg, https://github.com/Dhghomon/easy_rust/#strings, Learn Rust With Entirely Too Many Linked Lists: in-depth exploration of Rust’s memory management rules, through implementing a few different types of list structures
Think of a variable more as a binding.
Copying strings or vectors or other complex types can be expensive, so they don't implement the Copy trait and are instead moved.
References allow us to borrow values without taking ownership of them.
The original compiler was written in OCaml, and then eventually it was bootstrapped, and now Rust is written in Rust.
lifetimes allow Rust to ensure memory safety without the performance costs of garbage collection.
Rust forbids the combination of aliasing and mutation on the same location.
https://github.com/inancgumus/learnrust/blob/master/notes/faq.md
Read integer from stdin
Single quotes (') are used for char literals, whereas double quotes (") are used for string slices (&str)