feat: added excercise for option

This commit is contained in:
Sanjay K 2020-03-05 15:52:54 -05:00
parent 8b9479071c
commit 135e5d47a7
4 changed files with 48 additions and 2 deletions

2
Cargo.lock generated
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@ -592,7 +592,7 @@ dependencies = [
[[package]] [[package]]
name = "rustlings" name = "rustlings"
version = "2.2.0" version = "2.2.1"
dependencies = [ dependencies = [
"assert_cmd 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)", "assert_cmd 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
"clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)", "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",

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@ -0,0 +1,9 @@
### Option
#### Book Sections
To learn about Option<T>, check out these links:
- [Option Enum Format](https://doc.rust-lang.org/stable/book/ch10-01-syntax.html#in-enum-definitions)
- [Option Module Documentation](https://doc.rust-lang.org/std/option/)
- [Option Enum Documentation](https://doc.rust-lang.org/std/option/enum.Option.html)

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@ -0,0 +1,23 @@
//option1.rs
//Make me compile! Execute `rustlings hint option1` for hints
//I AM NOT DONE
//you can modify anything EXCEPT for this function's sig
fn print_number(maybe_number: Option<u16>) {
println!("printing: {}", *maybe_number);
}
fn main() {
print_number(13);
print_number(99);
let mut numbers: [Option<u16>; 5];
for iter in 0..5 {
let number_to_add: u16 = {
((iter * 5) + 2) / (4 * 16);
};
numbers[iter] = number_to_add;
}
}

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@ -701,4 +701,18 @@ path = "exercises/conversions/from_str.rs"
mode = "test" mode = "test"
hint = """ hint = """
If you've already solved try_from_into.rs, then this is almost a copy-paste. If you've already solved try_from_into.rs, then this is almost a copy-paste.
Otherwise, go ahead and solve try_from_into.rs first.""" Otherwise, go ahead and solve try_from_into.rs first."""
[[exercises]]
name = "option1"
path = "exercises/option/option1.rs"
mode = "compile"
hint = """
Check out some functions of Option:
is_some
is_none
unwrap
and:
pattern matching
"""