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- fn main() {
- let string_vec = vec!["1".to_string(), "2".to_string(), "3".to_string()];
- string_vec
- .iter()
- .map(|a: &String| a.parse::<i32>().unwrap())
- .map(|s| s * 2)
- .for_each(|k| println!("{}", k));
- }
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