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rustlings/exercises/option
History
Sateesh 399ab328d8
feat: Add move_semantics5 exercise. (#746) 
* feat: Add move_semantics5 exercise.

* feat: Add option3 exercise

* Address review comments. Fix typos, sentence formatting.

* Remove unwanted newline.

* Address review comments: make comment inline, fix format in print.
 		3 years ago
..
README.md docs(exercises): updated all exercises readme files 3 years ago
option1.rs fix(option1): Don't add only zeros to the numbers array 4 years ago
option2.rs fix(option2): Rename uninformative variables (#675) 3 years ago
option3.rs feat: Add move_semantics5 exercise. (#746) 3 years ago

README.md

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