10: Add solutions for section "collections".

Dependencies

• [2] H6XH45OP 0

Change contents

• edit in exercises/collections/vec2.rs at line 9
  [2.159825]→[2.159825:159843](∅→∅)
  −

  − // I AM NOT DONE
• replacement in exercises/collections/vec2.rs at line 12
  [2.159915]→[2.159915:160012](∅→∅)
  − // TODO: Fill this up so that each element in the Vec `v` is

  − // multiplied by 2.
  [2.159915]

  [2.160012]
  + *i *= 2;
• edit in exercises/collections/vec1.rs at line 6
  [2.160609]→[2.160609:160627](∅→∅)
  −

  − // I AM NOT DONE
• replacement in exercises/collections/vec1.rs at line 9
  [2.160720]→[2.160720:160793](∅→∅)
  − let v = // TODO: declare your vector here with the macro for vectors
  [2.160720]

  [2.160793]
  + let v = a.to_vec(); // TODO: declare your vector here with the macro for vectors
• edit in exercises/collections/hashmap2.rs at line 14
  [2.161532]→[2.161532:161550](∅→∅)
  −

  − // I AM NOT DONE
• edit in exercises/collections/hashmap2.rs at line 39
  [2.162083]

  [2.162083]
  + if !basket.contains_key(&fruit) {

  + basket.insert(fruit, 11);

  + }
• edit in exercises/collections/hashmap1.rs at line 13
  [2.163688]→[2.163688:163706](∅→∅)
  −

  − // I AM NOT DONE
• replacement in exercises/collections/hashmap1.rs at line 17
  [2.163783]→[2.163783:163841](∅→∅)
  − let mut basket = // TODO: declare your hash map here.
  [2.163783]

  [2.163841]
  + let mut basket: HashMap<String, u32> = [(String::from("apple"), 1), (String::from("orange"), 2)]

  + .iter().cloned().collect(); // TODO: declare your hash map here.