Programming-Idioms

Edit summary for version 47 by programming-idioms.org:
[Rust] Emphasis in comments

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2020-12-14, 22:31:58

2020-12-14, 22:32:28

Idiom #52 Check if map contains value

Determine whether map m contains an entry with value v, for some key.

Determine whether map m contains an entry with value v, for some key.

m,v

m,v

table dictionary hash

table dictionary hash

use std::collections::BTreeMap;

use std::collections::BTreeMap;

let does_contain = m.values()
        .any(|&val| *val == v);

let does_contain = m.values()
        .any(|&val| *val == v);

Works the same for `HashMap`.

Works the same for HashMap.

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