enumerate and zip in Rust

Pairing iterator items with indexes or each other.

fn main() {
    let words = ["ada", "grace", "kay"];

    for (i, word) in words.iter().enumerate() {
        println!("{i}: {word}");
    }

    let ids = [1, 2, 3];
    let paired: Vec<(i32, &str)> =
        ids.iter().copied().zip(words).collect();
    println!("{}", paired.len());
}

How it works

1. enumerate yields (index, item) pairs.
2. zip walks two iterators together.
3. collect builds a Vec of the pairs.

Keywords and builtins used here

• Vec
• fn
• for
• i32
• in
• let
• main
• str

The run, in numbers

Lines

12

Characters to type

247

Tokens

104

Three-star pace

95 tpm

At the three-star pace of 95 tokens a minute, this run takes about 66 seconds.

Type this snippet

Step 2 of 5 in Adapters, step 2 of 14 in Iterators & closures.

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