Rust: What is the difference between Vec and Array in Rust?

Vec — dynamic, heap. Array — fixed, stack.

Vec:

• Dynamic size.
• Heap allocated.
• Can grow/shrink.
• More flexible.

1let mut v = Vec::new();
2v.push(1);
3v.push(2);
4v.push(3);

Array:

• Fixed size.
• Stack allocated.
• Cannot change size.
• Faster.

1let a = [1, 2, 3];  // [i32; 3]
2let a = [0; 5];     // [i32; 5] - all zeros

Key differences:

• Vec — dynamic, heap.
• Array — fixed, stack.
• Vec — flexible.
• Array — fast.