rust push to vec
let a = vec![1, 2, 3];
assert_eq!(a.len(), 3);
5
1
let mut vec = Vec::new();
vec.push(1);
vec.push(2);
assert_eq!(vec.len(), 2);
assert_eq!(vec[0], 1);
assert_eq!(vec.pop(), Some(2));
assert_eq!(vec.len(), 1);
vec[0] = 7;
assert_eq!(vec[0], 7);
vec.extend([1, 2, 3].iter().copied());
for x in &vec {
println!("{}", x);
}
assert_eq!(vec, [7, 1, 2, 3]);
Thank you!
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