Editing Idiom 52 : Check if map contains value

Idiom

# 52 Check if map contains value

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Lead paragraph

Determine whether map _m contains an entry with value _v, for some key.

Implementation

Language

Perl

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Imports

Code

print "Found it!" if exists $m{$v};

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Implementation edit is for fixing errors and enhancing with metadata.

Instead of changing the code of the snippet, consider creating another Perl implementation.

Other implementations

import java.util.Map;

m.containsValue(v)

func containsValue(m map[K]T, v T) bool {
	for _, x := range m {
		if x == v {
			return true
		}
	}
	return false
}

use std::collections::BTreeMap;

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

import std.algorithm;

m.byValue.canFind(v);

m.containsValue(v);

v in m.values()

uses fgl;

m.IndexOfData(v) >= 0

m.value?(v)

Map.values(m) |> Enum.member?(v)

elem v (elems m)

in_array($v, $m, true);

Object.values(m).includes(v)

!m.values.find(_ == v).isEmpty()

using System.Collections.Generic;

m.ContainsValue(v)

#include <algorithm>

std::find_if(m.begin(), m.end(), [v](const auto& mo) {return mo.second == v; }) != m.end();

[...m.values()].includes(v)