สนิมลั vec

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1
0

เข้าใจความยาวของเว็กเตอร์สนิม

let a = vec![1, 2, 3];
assert_eq!(a.len(), 3);
0
0

สนิมลั vec

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]);

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