Vectors in Rust

The growable Vec and its everyday methods.

fn main() {
    let mut nums = vec![3, 1, 4, 1, 5];
    nums.push(9);
    nums.sort();
    nums.dedup();

    let first = nums.first().copied().unwrap_or(0);
    let total: i32 = nums.iter().sum();
    let slice = &nums[1..3];
    println!("{first} {total} {}", slice.len());
}

How it works

1. vec! builds one; push appends.
2. sort and dedup reorder and compact in place.
3. iter().sum() and slicing read across it.

Keywords and builtins used here

• fn
• i32
• let
• main
• mut

The run, in numbers

Lines

11

Characters to type

245

Tokens

99

Three-star pace

90 tpm

At the three-star pace of 90 tokens a minute, this run takes about 66 seconds.

Type this snippet

Step 1 of 8 in Collections, step 30 of 39 in Language basics.

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