31 lines
675 B
Rust
31 lines
675 B
Rust
// vec2.rs
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// A Vec of even numbers is given. Your task is to complete the loop
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// so that each number in the Vec is multiplied by 2.
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//
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// Make me pass the test!
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//
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// Execute the command `rustlings hint vec2` if you need
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// hints.
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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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*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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v
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_vec_loop() {
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let v: Vec<i32> = (1..).filter(|x| x % 2 == 0).take(5).collect();
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let ans = vec_loop(v.clone());
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assert_eq!(ans, v.iter().map(|x| x * 2).collect::<Vec<i32>>());
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}
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}
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