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changing solutions/iterators/iterators3.rs update issue#2212 #2246

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6b31782
changing solutions/iterators/iterators3.rs
Lori-Shu May 17, 2025
7b3edfe
solve compile error
Lori-Shu May 17, 2025
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224 changes: 223 additions & 1 deletion dev-Cargo.toml
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Original file line number Diff line number Diff line change
@@ -1 +1,223 @@
dev/Cargo.toml
# Don't edit the `bin` list manually! It is updated by `cargo dev update`. This comment line will be stripped in `rustlings init`.
bin = [
{ name = "intro1", path = "../exercises/00_intro/intro1.rs" },
{ name = "intro1_sol", path = "../solutions/00_intro/intro1.rs" },
{ name = "intro2", path = "../exercises/00_intro/intro2.rs" },
{ name = "intro2_sol", path = "../solutions/00_intro/intro2.rs" },
{ name = "variables1", path = "../exercises/01_variables/variables1.rs" },
{ name = "variables1_sol", path = "../solutions/01_variables/variables1.rs" },
{ name = "variables2", path = "../exercises/01_variables/variables2.rs" },
{ name = "variables2_sol", path = "../solutions/01_variables/variables2.rs" },
{ name = "variables3", path = "../exercises/01_variables/variables3.rs" },
{ name = "variables3_sol", path = "../solutions/01_variables/variables3.rs" },
{ name = "variables4", path = "../exercises/01_variables/variables4.rs" },
{ name = "variables4_sol", path = "../solutions/01_variables/variables4.rs" },
{ name = "variables5", path = "../exercises/01_variables/variables5.rs" },
{ name = "variables5_sol", path = "../solutions/01_variables/variables5.rs" },
{ name = "variables6", path = "../exercises/01_variables/variables6.rs" },
{ name = "variables6_sol", path = "../solutions/01_variables/variables6.rs" },
{ name = "functions1", path = "../exercises/02_functions/functions1.rs" },
{ name = "functions1_sol", path = "../solutions/02_functions/functions1.rs" },
{ name = "functions2", path = "../exercises/02_functions/functions2.rs" },
{ name = "functions2_sol", path = "../solutions/02_functions/functions2.rs" },
{ name = "functions3", path = "../exercises/02_functions/functions3.rs" },
{ name = "functions3_sol", path = "../solutions/02_functions/functions3.rs" },
{ name = "functions4", path = "../exercises/02_functions/functions4.rs" },
{ name = "functions4_sol", path = "../solutions/02_functions/functions4.rs" },
{ name = "functions5", path = "../exercises/02_functions/functions5.rs" },
{ name = "functions5_sol", path = "../solutions/02_functions/functions5.rs" },
{ name = "if1", path = "../exercises/03_if/if1.rs" },
{ name = "if1_sol", path = "../solutions/03_if/if1.rs" },
{ name = "if2", path = "../exercises/03_if/if2.rs" },
{ name = "if2_sol", path = "../solutions/03_if/if2.rs" },
{ name = "if3", path = "../exercises/03_if/if3.rs" },
{ name = "if3_sol", path = "../solutions/03_if/if3.rs" },
{ name = "quiz1", path = "../exercises/quizzes/quiz1.rs" },
{ name = "quiz1_sol", path = "../solutions/quizzes/quiz1.rs" },
{ name = "primitive_types1", path = "../exercises/04_primitive_types/primitive_types1.rs" },
{ name = "primitive_types1_sol", path = "../solutions/04_primitive_types/primitive_types1.rs" },
{ name = "primitive_types2", path = "../exercises/04_primitive_types/primitive_types2.rs" },
{ name = "primitive_types2_sol", path = "../solutions/04_primitive_types/primitive_types2.rs" },
{ name = "primitive_types3", path = "../exercises/04_primitive_types/primitive_types3.rs" },
{ name = "primitive_types3_sol", path = "../solutions/04_primitive_types/primitive_types3.rs" },
{ name = "primitive_types4", path = "../exercises/04_primitive_types/primitive_types4.rs" },
{ name = "primitive_types4_sol", path = "../solutions/04_primitive_types/primitive_types4.rs" },
{ name = "primitive_types5", path = "../exercises/04_primitive_types/primitive_types5.rs" },
{ name = "primitive_types5_sol", path = "../solutions/04_primitive_types/primitive_types5.rs" },
{ name = "primitive_types6", path = "../exercises/04_primitive_types/primitive_types6.rs" },
{ name = "primitive_types6_sol", path = "../solutions/04_primitive_types/primitive_types6.rs" },
{ name = "vecs1", path = "../exercises/05_vecs/vecs1.rs" },
{ name = "vecs1_sol", path = "../solutions/05_vecs/vecs1.rs" },
{ name = "vecs2", path = "../exercises/05_vecs/vecs2.rs" },
{ name = "vecs2_sol", path = "../solutions/05_vecs/vecs2.rs" },
{ name = "move_semantics1", path = "../exercises/06_move_semantics/move_semantics1.rs" },
{ name = "move_semantics1_sol", path = "../solutions/06_move_semantics/move_semantics1.rs" },
{ name = "move_semantics2", path = "../exercises/06_move_semantics/move_semantics2.rs" },
{ name = "move_semantics2_sol", path = "../solutions/06_move_semantics/move_semantics2.rs" },
{ name = "move_semantics3", path = "../exercises/06_move_semantics/move_semantics3.rs" },
{ name = "move_semantics3_sol", path = "../solutions/06_move_semantics/move_semantics3.rs" },
{ name = "move_semantics4", path = "../exercises/06_move_semantics/move_semantics4.rs" },
{ name = "move_semantics4_sol", path = "../solutions/06_move_semantics/move_semantics4.rs" },
{ name = "move_semantics5", path = "../exercises/06_move_semantics/move_semantics5.rs" },
{ name = "move_semantics5_sol", path = "../solutions/06_move_semantics/move_semantics5.rs" },
{ name = "structs1", path = "../exercises/07_structs/structs1.rs" },
{ name = "structs1_sol", path = "../solutions/07_structs/structs1.rs" },
{ name = "structs2", path = "../exercises/07_structs/structs2.rs" },
{ name = "structs2_sol", path = "../solutions/07_structs/structs2.rs" },
{ name = "structs3", path = "../exercises/07_structs/structs3.rs" },
{ name = "structs3_sol", path = "../solutions/07_structs/structs3.rs" },
{ name = "enums1", path = "../exercises/08_enums/enums1.rs" },
{ name = "enums1_sol", path = "../solutions/08_enums/enums1.rs" },
{ name = "enums2", path = "../exercises/08_enums/enums2.rs" },
{ name = "enums2_sol", path = "../solutions/08_enums/enums2.rs" },
{ name = "enums3", path = "../exercises/08_enums/enums3.rs" },
{ name = "enums3_sol", path = "../solutions/08_enums/enums3.rs" },
{ name = "strings1", path = "../exercises/09_strings/strings1.rs" },
{ name = "strings1_sol", path = "../solutions/09_strings/strings1.rs" },
{ name = "strings2", path = "../exercises/09_strings/strings2.rs" },
{ name = "strings2_sol", path = "../solutions/09_strings/strings2.rs" },
{ name = "strings3", path = "../exercises/09_strings/strings3.rs" },
{ name = "strings3_sol", path = "../solutions/09_strings/strings3.rs" },
{ name = "strings4", path = "../exercises/09_strings/strings4.rs" },
{ name = "strings4_sol", path = "../solutions/09_strings/strings4.rs" },
{ name = "modules1", path = "../exercises/10_modules/modules1.rs" },
{ name = "modules1_sol", path = "../solutions/10_modules/modules1.rs" },
{ name = "modules2", path = "../exercises/10_modules/modules2.rs" },
{ name = "modules2_sol", path = "../solutions/10_modules/modules2.rs" },
{ name = "modules3", path = "../exercises/10_modules/modules3.rs" },
{ name = "modules3_sol", path = "../solutions/10_modules/modules3.rs" },
{ name = "hashmaps1", path = "../exercises/11_hashmaps/hashmaps1.rs" },
{ name = "hashmaps1_sol", path = "../solutions/11_hashmaps/hashmaps1.rs" },
{ name = "hashmaps2", path = "../exercises/11_hashmaps/hashmaps2.rs" },
{ name = "hashmaps2_sol", path = "../solutions/11_hashmaps/hashmaps2.rs" },
{ name = "hashmaps3", path = "../exercises/11_hashmaps/hashmaps3.rs" },
{ name = "hashmaps3_sol", path = "../solutions/11_hashmaps/hashmaps3.rs" },
{ name = "quiz2", path = "../exercises/quizzes/quiz2.rs" },
{ name = "quiz2_sol", path = "../solutions/quizzes/quiz2.rs" },
{ name = "options1", path = "../exercises/12_options/options1.rs" },
{ name = "options1_sol", path = "../solutions/12_options/options1.rs" },
{ name = "options2", path = "../exercises/12_options/options2.rs" },
{ name = "options2_sol", path = "../solutions/12_options/options2.rs" },
{ name = "options3", path = "../exercises/12_options/options3.rs" },
{ name = "options3_sol", path = "../solutions/12_options/options3.rs" },
{ name = "errors1", path = "../exercises/13_error_handling/errors1.rs" },
{ name = "errors1_sol", path = "../solutions/13_error_handling/errors1.rs" },
{ name = "errors2", path = "../exercises/13_error_handling/errors2.rs" },
{ name = "errors2_sol", path = "../solutions/13_error_handling/errors2.rs" },
{ name = "errors3", path = "../exercises/13_error_handling/errors3.rs" },
{ name = "errors3_sol", path = "../solutions/13_error_handling/errors3.rs" },
{ name = "errors4", path = "../exercises/13_error_handling/errors4.rs" },
{ name = "errors4_sol", path = "../solutions/13_error_handling/errors4.rs" },
{ name = "errors5", path = "../exercises/13_error_handling/errors5.rs" },
{ name = "errors5_sol", path = "../solutions/13_error_handling/errors5.rs" },
{ name = "errors6", path = "../exercises/13_error_handling/errors6.rs" },
{ name = "errors6_sol", path = "../solutions/13_error_handling/errors6.rs" },
{ name = "generics1", path = "../exercises/14_generics/generics1.rs" },
{ name = "generics1_sol", path = "../solutions/14_generics/generics1.rs" },
{ name = "generics2", path = "../exercises/14_generics/generics2.rs" },
{ name = "generics2_sol", path = "../solutions/14_generics/generics2.rs" },
{ name = "traits1", path = "../exercises/15_traits/traits1.rs" },
{ name = "traits1_sol", path = "../solutions/15_traits/traits1.rs" },
{ name = "traits2", path = "../exercises/15_traits/traits2.rs" },
{ name = "traits2_sol", path = "../solutions/15_traits/traits2.rs" },
{ name = "traits3", path = "../exercises/15_traits/traits3.rs" },
{ name = "traits3_sol", path = "../solutions/15_traits/traits3.rs" },
{ name = "traits4", path = "../exercises/15_traits/traits4.rs" },
{ name = "traits4_sol", path = "../solutions/15_traits/traits4.rs" },
{ name = "traits5", path = "../exercises/15_traits/traits5.rs" },
{ name = "traits5_sol", path = "../solutions/15_traits/traits5.rs" },
{ name = "quiz3", path = "../exercises/quizzes/quiz3.rs" },
{ name = "quiz3_sol", path = "../solutions/quizzes/quiz3.rs" },
{ name = "lifetimes1", path = "../exercises/16_lifetimes/lifetimes1.rs" },
{ name = "lifetimes1_sol", path = "../solutions/16_lifetimes/lifetimes1.rs" },
{ name = "lifetimes2", path = "../exercises/16_lifetimes/lifetimes2.rs" },
{ name = "lifetimes2_sol", path = "../solutions/16_lifetimes/lifetimes2.rs" },
{ name = "lifetimes3", path = "../exercises/16_lifetimes/lifetimes3.rs" },
{ name = "lifetimes3_sol", path = "../solutions/16_lifetimes/lifetimes3.rs" },
{ name = "tests1", path = "../exercises/17_tests/tests1.rs" },
{ name = "tests1_sol", path = "../solutions/17_tests/tests1.rs" },
{ name = "tests2", path = "../exercises/17_tests/tests2.rs" },
{ name = "tests2_sol", path = "../solutions/17_tests/tests2.rs" },
{ name = "tests3", path = "../exercises/17_tests/tests3.rs" },
{ name = "tests3_sol", path = "../solutions/17_tests/tests3.rs" },
{ name = "iterators1", path = "../exercises/18_iterators/iterators1.rs" },
{ name = "iterators1_sol", path = "../solutions/18_iterators/iterators1.rs" },
{ name = "iterators2", path = "../exercises/18_iterators/iterators2.rs" },
{ name = "iterators2_sol", path = "../solutions/18_iterators/iterators2.rs" },
{ name = "iterators3", path = "../exercises/18_iterators/iterators3.rs" },
{ name = "iterators3_sol", path = "../solutions/18_iterators/iterators3.rs" },
{ name = "iterators4", path = "../exercises/18_iterators/iterators4.rs" },
{ name = "iterators4_sol", path = "../solutions/18_iterators/iterators4.rs" },
{ name = "iterators5", path = "../exercises/18_iterators/iterators5.rs" },
{ name = "iterators5_sol", path = "../solutions/18_iterators/iterators5.rs" },
{ name = "box1", path = "../exercises/19_smart_pointers/box1.rs" },
{ name = "box1_sol", path = "../solutions/19_smart_pointers/box1.rs" },
{ name = "rc1", path = "../exercises/19_smart_pointers/rc1.rs" },
{ name = "rc1_sol", path = "../solutions/19_smart_pointers/rc1.rs" },
{ name = "arc1", path = "../exercises/19_smart_pointers/arc1.rs" },
{ name = "arc1_sol", path = "../solutions/19_smart_pointers/arc1.rs" },
{ name = "cow1", path = "../exercises/19_smart_pointers/cow1.rs" },
{ name = "cow1_sol", path = "../solutions/19_smart_pointers/cow1.rs" },
{ name = "threads1", path = "../exercises/20_threads/threads1.rs" },
{ name = "threads1_sol", path = "../solutions/20_threads/threads1.rs" },
{ name = "threads2", path = "../exercises/20_threads/threads2.rs" },
{ name = "threads2_sol", path = "../solutions/20_threads/threads2.rs" },
{ name = "threads3", path = "../exercises/20_threads/threads3.rs" },
{ name = "threads3_sol", path = "../solutions/20_threads/threads3.rs" },
{ name = "macros1", path = "../exercises/21_macros/macros1.rs" },
{ name = "macros1_sol", path = "../solutions/21_macros/macros1.rs" },
{ name = "macros2", path = "../exercises/21_macros/macros2.rs" },
{ name = "macros2_sol", path = "../solutions/21_macros/macros2.rs" },
{ name = "macros3", path = "../exercises/21_macros/macros3.rs" },
{ name = "macros3_sol", path = "../solutions/21_macros/macros3.rs" },
{ name = "macros4", path = "../exercises/21_macros/macros4.rs" },
{ name = "macros4_sol", path = "../solutions/21_macros/macros4.rs" },
{ name = "clippy1", path = "../exercises/22_clippy/clippy1.rs" },
{ name = "clippy1_sol", path = "../solutions/22_clippy/clippy1.rs" },
{ name = "clippy2", path = "../exercises/22_clippy/clippy2.rs" },
{ name = "clippy2_sol", path = "../solutions/22_clippy/clippy2.rs" },
{ name = "clippy3", path = "../exercises/22_clippy/clippy3.rs" },
{ name = "clippy3_sol", path = "../solutions/22_clippy/clippy3.rs" },
{ name = "using_as", path = "../exercises/23_conversions/using_as.rs" },
{ name = "using_as_sol", path = "../solutions/23_conversions/using_as.rs" },
{ name = "from_into", path = "../exercises/23_conversions/from_into.rs" },
{ name = "from_into_sol", path = "../solutions/23_conversions/from_into.rs" },
{ name = "from_str", path = "../exercises/23_conversions/from_str.rs" },
{ name = "from_str_sol", path = "../solutions/23_conversions/from_str.rs" },
{ name = "try_from_into", path = "../exercises/23_conversions/try_from_into.rs" },
{ name = "try_from_into_sol", path = "../solutions/23_conversions/try_from_into.rs" },
{ name = "as_ref_mut", path = "../exercises/23_conversions/as_ref_mut.rs" },
{ name = "as_ref_mut_sol", path = "../solutions/23_conversions/as_ref_mut.rs" },
]

[package]
name = "exercises"
edition = "2024"
# Don't publish the exercises on crates.io!
publish = false

[profile.release]
panic = "abort"

[profile.dev]
panic = "abort"

[lints.rust]
# You shouldn't write unsafe code in Rustlings!
unsafe_code = "forbid"
# You don't need unstable features in Rustlings and shouldn't rely on them while learning Rust.
unstable_features = "forbid"
# Dead code warnings can't be avoided in some exercises and might distract while learning.
dead_code = "allow"

[lints.clippy]
# You forgot a `todo!()`!
todo = "forbid"
# This can only happen by mistake in Rustlings.
empty_loop = "forbid"
# No infinite loops are needed in Rustlings.
infinite_loop = "deny"
# You shouldn't leak memory while still learning Rust!
mem_forget = "deny"
# Currently, there are no disallowed methods. This line avoids problems when developing Rustlings.
disallowed_methods = "allow"
38 changes: 29 additions & 9 deletions solutions/18_iterators/iterators3.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -24,19 +24,33 @@ fn divide(a: i64, b: i64) -> Result<i64, DivisionError> {
Ok(a / b)
}

fn result_with_list() -> Result<Vec<i64>, DivisionError> {
fn result_with_list(numbers: Vec<i64>, b: i64) -> Result<Vec<i64>, DivisionError> {
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
let numbers = [27, 297, 38502, 81];
let division_results = numbers.into_iter().map(|n| divide(n, 27));
let division_results = numbers.into_iter().map(|n| divide(n, b));
// Collects to the expected return type. Returns the first error in the
// division results (if one exists).
division_results.collect()
match division_results.find(|n| match n {
Ok(num) => return false,
Err(e) => return true,
}) {
Some(r) => return Err(r.unwrap_err()),
None => {
let ans: Vec<i64> = division_results
.map(|n| {
return match n {
Ok(num) => return num,
Err(e) => return -1,
};
})
.collect();
return Ok(ans);
}
}
}

fn list_of_results() -> Vec<Result<i64, DivisionError>> {
fn list_of_results(numbers: Vec<i64>, b: i64) -> Vec<Result<i64, DivisionError>> {
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
let numbers = [27, 297, 38502, 81];
let division_results = numbers.into_iter().map(|n| divide(n, 27));
let division_results = numbers.into_iter().map(|n| divide(n, b));
// Collects to the expected return type.
division_results.collect()
}
Expand Down Expand Up @@ -76,11 +90,17 @@ mod tests {

#[test]
fn test_result_with_list() {
assert_eq!(result_with_list().unwrap(), [1, 11, 1426, 3]);
assert_eq!(
result_with_list(vec![27, 297, 38502, 81], 27).unwrap(),
[1, 11, 1426, 3]
);
}

#[test]
fn test_list_of_results() {
assert_eq!(list_of_results(), [Ok(1), Ok(11), Ok(1426), Ok(3)]);
assert_eq!(
list_of_results(vec![27, 297, 38502, 81], 27),
[Ok(1), Ok(11), Ok(1426), Ok(3)]
);
}
}
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