Rust/Trait

• like an Interface in Java or Py/Protocol
• seems to be usually upper-cased like Rust/crate/rand/Rng
  • In this case, could think of Rng (Random Number Generator) like POSIX; it's a standard interface for which there are many distributions or variations
  • Programming a Guessing Game - The Rust Programming Language

    • This [gen_range] method is defined by the Rng trait that we brought into scope with the use rand::Rng; statement