CODEWITHSUNDEEP
groovy
Dnyaneshwar Ekhande
Dnyaneshwar Ekhande

Reputation: 51

How to find a map key by value of nested map in Groovy

I have a map with another map as its value in Groovy.

Example:

[K1 : [k2:v2]]

Now I want find v2 using K1 key and have to return K1.

I am using .each loop but .each loop continues to run until the end even if I return K1 in between.

Also I get the whole map as a return value though I expect only K1 key.

Upvotes: 1

Views: 2808

Answers (2)

Pankaj Kanti
Pankaj Kanti

Reputation: 93

You can check this : 

[K1: [k2: 'v2'], K3: [k4: 'v4']].find {'v2' in it.value.values() }?.key

Upvotes: 1

Vampire
Vampire

Reputation: 38619

The each method as its name implies always goes through each and every element, the return value of the closure is ignored and the return value again is the complete map as you observed. This is the defined behavior for each.

What you want to use is the find method which finds the first entry that conforms to your criterion and then use its key like. Something like:

[K1: [k2: 'v2'], K3: [k4: 'v4']].find { it.value.k2 == 'v2' }.key

Upvotes: 0

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