Programming-Idioms

History of Idiom 52 > diff from v48 to v49

Edit summary for version 49 by programming-idioms.org:
[Rust] +DemoURL

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Version 48

2020-12-14, 22:37:19

Version 49

2020-12-14, 23:08:09

Idiom #52 Check if map contains value

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

Idiom #52 Check if map contains value

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

Variables

m,v

Variables

m,v

Extra Keywords

table dictionary hash

Extra Keywords

table dictionary hash

Rust

Rust

Imports

use std::collections::BTreeMap;

Imports

use std::collections::BTreeMap;

Code

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

Code

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

Comments bubble

Works the same for HashMap.

Comments bubble

Works the same for HashMap.

Demo URL

https://play.rust-lang.org/?version=stable&mode=debug&edition=2015&gist=e51781a1c9400c7e17423a3d06c64b27

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History of Idiom 52 > diff from v48 to v49

Version 48

Version 49

Idiom #52 Check if map contains value

Idiom #52 Check if map contains value

Variables

Variables

Extra Keywords

Extra Keywords

Imports

Imports

Code

Code

Comments bubble

Comments bubble

Demo URL

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