Learning about vectors
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@ -1,12 +1,10 @@
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// move_semantics1.rs
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// Execute `rustlings hint move_semantics1` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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fn main() {
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let vec0 = Vec::new();
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let vec1 = fill_vec(vec0);
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let mut vec1 = fill_vec(vec0);
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println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
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@ -2,12 +2,10 @@
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// Make me compile without changing line 13 or moving line 10!
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// Execute `rustlings hint move_semantics2` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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fn main() {
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let vec0 = Vec::new();
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let mut vec0 = Vec::new();
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let mut vec1 = fill_vec(vec0);
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let mut vec1 = fill_vec(&mut vec0);
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// Do not change the following line!
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println!("{} has length {} content `{:?}`", "vec0", vec0.len(), vec0);
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@ -17,12 +15,12 @@ fn main() {
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println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
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}
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fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
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fn fill_vec(vec: &mut Vec<i32>) -> Vec<i32> {
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let mut vec = vec;
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vec.push(22);
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vec.push(44);
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vec.push(66);
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vec
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vec.to_vec()
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}
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@ -3,8 +3,6 @@
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// (no lines with multiple semicolons necessary!)
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// Execute `rustlings hint move_semantics3` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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fn main() {
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let vec0 = Vec::new();
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@ -17,7 +15,7 @@ fn main() {
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println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
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}
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fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
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fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
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vec.push(22);
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vec.push(44);
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vec.push(66);
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@ -4,11 +4,9 @@
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// Make me compile and pass the test!
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// Execute `rustlings hint vecs1` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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fn array_and_vec() -> ([i32; 4], Vec<i32>) {
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let a = [10, 20, 30, 40]; // a plain array
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let v = // TODO: declare your vector here with the macro for vectors
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let v = vec![10, 20, 30, 40]; // TODO: declare your vector here with the macro for vectors
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(a, v)
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}
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@ -6,13 +6,11 @@
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//
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// Execute `rustlings hint vecs2` or use the `hint` watch subcommand for a hint.
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// I AM NOT DONE
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fn vec_loop(mut v: Vec<i32>) -> Vec<i32> {
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for i in v.iter_mut() {
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// TODO: Fill this up so that each element in the Vec `v` is
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// multiplied by 2.
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???
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*i *= 2;
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}
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// At this point, `v` should be equal to [4, 8, 12, 16, 20].
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@ -23,7 +21,7 @@ fn vec_map(v: &Vec<i32>) -> Vec<i32> {
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v.iter().map(|num| {
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// TODO: Do the same thing as above - but instead of mutating the
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// Vec, you can just return the new number!
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???
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num * 2
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}).collect()
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}
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