1
0
mirror of https://github.com/rust-lang/rustlings.git synced 2024-12-12 11:14:55 +02:00
rustlings/exercises/12_options
2024-07-08 16:00:12 +02:00
..
options1.rs Add comment to options1 2024-07-04 13:00:04 +02:00
options2.rs option2 solution 2024-06-26 14:35:05 +02:00
options3.rs options3 solution 2024-06-26 14:47:57 +02:00
README.md Remove stable from book links 2024-07-08 16:00:12 +02:00

Options

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