Crate to_vec

to_vec, to_set andto_map are specializations of collect in the usual case where you do want these containers.

use to_vec::ToVec;

let v = "one two three".split_whitespace().to_vec();
assert_eq!(v,&["one","two","three"]);

There’s a specialized form for collecting Result<T,E> into Result<Vec<T>,E>, where the error is the first error encountered.

use to_vec::ToVecResult;

let numbers = "23E 5F5 FF00".split_whitespace()
    .map(|s| u32::from_str_radix(s,16)).to_vec_result().unwrap();

assert_eq!(numbers,&[0x23E, 0x5F5, 0xFF00]);

to_map and to_set are different - they operate on iterators of references and implicitly clone this.

use to_vec::ToMap;
const VALUES: &[(&str,i32)] = &[("hello",10),("dolly",20)];

let map = VALUES.iter().to_map();

assert_eq!(map.get("hello"),Some(&10));
assert_eq!(map.get("dolly"),Some(&20));

This implicit cloning behaviour is very useful for sets (here defined as HashSet):

use to_vec::ToSet;

let colours = ["green","orange","blue"].iter().to_set();
let fruit = ["apple","banana","orange"].iter().to_set();
let common = colours.intersection(&fruit).to_set();
assert_eq!(common, ["orange"].iter().to_set());

Traits

ToMap

to_map() method on iterators of references

ToSet

to_set() method on iterators of references

ToVec

to_vec() method on iterators

ToVecResult

to_vec_result() method on iterators