1
0
mirror of https://github.com/rust-lang/rustlings.git synced 2024-12-14 11:22:55 +02:00
rustlings/exercises/option/README.md
Zerotask 249ad44cc0
docs(exercises): updated all exercises readme files
all exercises readme files now have a unified structure and a description
2021-04-23 19:54:31 +02:00

854 B

Option

Type Option represents an optional value: every Option is either Some and contains a value, or None, and does not. Option types are very common in Rust code, as they have a number of uses:

  • Initial values
  • Return values for functions that are not defined over their entire input range (partial functions)
  • Return value for otherwise reporting simple errors, where None is returned on error
  • Optional struct fields
  • Struct fields that can be loaned or "taken"
  • Optional function arguments
  • Nullable pointers
  • Swapping things out of difficult situations

Further Information