rustlings/exercises/options
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Update options1.rs
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README.md fix: rename option to options 2022-07-14 17:34:50 +02:00
options1.rs Update options1.rs 2022-08-17 13:51:17 +09:00
options2.rs feat(options): add hint comments 2022-07-14 17:53:42 +02:00
options3.rs feat(options): add hint comments 2022-07-14 17:53:42 +02:00

README.md

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