How can a create a string joining all keys of a hashmap in rust and adding a separator among each of them? I am very new to rust.
In python it would be something like this:
>>> ', '.join({'a':'x', 'b':'y'}.keys())
'a, b'
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1iter over keys, then use the duplicateStargateur– Stargateur2019-04-09 14:40:43 +00:00Commented Apr 9, 2019 at 14:40
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1 Answer
In Rust, HashMaps are not ordered, so the actual order of the keys in the String will be undefined.
If that is not a problem, you could do it like this:
use std::collections::HashMap;
let mut hm = HashMap::new();
hm.insert("a", ());
hm.insert("b", ());
hm.insert("c", ());
hm.insert("d", ());
hm.insert("e", ());
let s = hm.keys().map(|s| &**s).collect::<Vec<_>>().join(", ");
