Map Doubles

Use .iter() and .map() to double every number in vec![1, 2, 3, 4, 5]. Collect the results into a new Vec<i32> and print it.

Expected output:

[2, 4, 6, 8, 10]

Hints:

• Use .iter().map(|x| x * 2).collect()
• You need a type annotation: let doubled: Vec<i32> = ...
• Print with {:?}