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How to retrieve a key from the Map> based on its value (an element of a list)?

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2

I have a map looking like this:

def myMap = [
 'Key1': ['nameOfApp', 'nameOfApp2', 'nameOfApp3'],
 'Key5': ['nameOfApp4'],
 'Key2': ['nameOfApp5'],
 'Key3': ['xxx', 'yyy'],
 'Key4': ['aaa', 'vvv']
]

How can I find the KEY by providing a VALUE (which is a simple String value) ? I've tried lots of things but I'm blocked with the fact that values are lists...

As an example, if I provide nameOfApp2, I expect to get the key Key1. What's the easiest way to achieve it with Groovy?

groovy

share|improve this question

edited Mar 8 at 13:21

Szymon Stepniak

18.9k83566

asked Mar 8 at 13:10

Tony LecointreTony Lecointre

133

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Boggles the mind why anyone would design a map and look up something by “value” why don’t you invert the map?
  
  – Strelok
  Mar 8 at 13:55
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The fact is that I can't update this part of the code because it's not on my scope. I'm using this map via Jenkins External Library.
  
  – Tony Lecointre
  Mar 8 at 14:11
  

  
  
  
  

add a comment | 

2

I have a map looking like this:

def myMap = [
 'Key1': ['nameOfApp', 'nameOfApp2', 'nameOfApp3'],
 'Key5': ['nameOfApp4'],
 'Key2': ['nameOfApp5'],
 'Key3': ['xxx', 'yyy'],
 'Key4': ['aaa', 'vvv']
]

How can I find the KEY by providing a VALUE (which is a simple String value) ? I've tried lots of things but I'm blocked with the fact that values are lists...

As an example, if I provide nameOfApp2, I expect to get the key Key1. What's the easiest way to achieve it with Groovy?

groovy

share|improve this question

edited Mar 8 at 13:21

Szymon Stepniak

18.9k83566

asked Mar 8 at 13:10

Tony LecointreTony Lecointre

133

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Boggles the mind why anyone would design a map and look up something by “value” why don’t you invert the map?
  
  – Strelok
  Mar 8 at 13:55
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The fact is that I can't update this part of the code because it's not on my scope. I'm using this map via Jenkins External Library.
  
  – Tony Lecointre
  Mar 8 at 14:11
  

  
  
  
  

add a comment | 

I have a map looking like this:

def myMap = [
 'Key1': ['nameOfApp', 'nameOfApp2', 'nameOfApp3'],
 'Key5': ['nameOfApp4'],
 'Key2': ['nameOfApp5'],
 'Key3': ['xxx', 'yyy'],
 'Key4': ['aaa', 'vvv']
]

How can I find the KEY by providing a VALUE (which is a simple String value) ? I've tried lots of things but I'm blocked with the fact that values are lists...

As an example, if I provide nameOfApp2, I expect to get the key Key1. What's the easiest way to achieve it with Groovy?

groovy

share|improve this question

edited Mar 8 at 13:21

Szymon Stepniak

18.9k83566

asked Mar 8 at 13:10

Tony LecointreTony Lecointre

133

def myMap = [
 'Key1': ['nameOfApp', 'nameOfApp2', 'nameOfApp3'],
 'Key5': ['nameOfApp4'],
 'Key2': ['nameOfApp5'],
 'Key3': ['xxx', 'yyy'],
 'Key4': ['aaa', 'vvv']
]

share|improve this question

edited Mar 8 at 13:21

Szymon Stepniak

18.9k83566

asked Mar 8 at 13:10

Tony LecointreTony Lecointre

133

share|improve this question

edited Mar 8 at 13:21

Szymon Stepniak

18.9k83566

asked Mar 8 at 13:10

Tony LecointreTony Lecointre

133

edited Mar 8 at 13:21

Szymon Stepniak

18.9k83566

edited Mar 8 at 13:21

Szymon Stepniak

18.9k83566

asked Mar 8 at 13:10

Tony LecointreTony Lecointre

133

asked Mar 8 at 13:10

Tony LecointreTony Lecointre

133

1 Answer
1

active

oldest

votes

2

You can use find method with a predicate like expectedValue in it.value. Check the following example:

def myMap = [
 'Key1': ['nameOfApp', 'nameOfApp2', 'nameOfApp3'],
 'Key5': ['nameOfApp4'],
 'Key2': ['nameOfApp5'],
 'Key3': ['xxx', 'yyy'],
 'Key4': ['aaa', 'vvv']
]

def expectedValue = 'nameOfApp2'

def key = myMap.find expectedValue in it.value ?.key

assert key == 'Key1'

The variable it inside the predicate closure represents each Map.Entry<String. List<String>> from the input map, so you can check if the expected value is a part of it.value list. And the last part uses ?.key null safe operator to get the value of the key, just in case expected value is not present in any list.

share|improve this answer

edited Mar 8 at 13:52

answered Mar 8 at 13:14

Szymon StepniakSzymon Stepniak

18.9k83566

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks a lot, it works well. I was really close but my knowledges about Groovy are low. Thanks again :)
  
  – Tony Lecointre
  Mar 8 at 13:18
  

  
  
  
  

add a comment | 

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2

You can use find method with a predicate like expectedValue in it.value. Check the following example:

def myMap = [
 'Key1': ['nameOfApp', 'nameOfApp2', 'nameOfApp3'],
 'Key5': ['nameOfApp4'],
 'Key2': ['nameOfApp5'],
 'Key3': ['xxx', 'yyy'],
 'Key4': ['aaa', 'vvv']
]

def expectedValue = 'nameOfApp2'

def key = myMap.find expectedValue in it.value ?.key

assert key == 'Key1'

The variable it inside the predicate closure represents each Map.Entry<String. List<String>> from the input map, so you can check if the expected value is a part of it.value list. And the last part uses ?.key null safe operator to get the value of the key, just in case expected value is not present in any list.

share|improve this answer

edited Mar 8 at 13:52

answered Mar 8 at 13:14

Szymon StepniakSzymon Stepniak

18.9k83566

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks a lot, it works well. I was really close but my knowledges about Groovy are low. Thanks again :)
  
  – Tony Lecointre
  Mar 8 at 13:18
  

  
  
  
  

add a comment | 

2

You can use find method with a predicate like expectedValue in it.value. Check the following example:

def myMap = [
 'Key1': ['nameOfApp', 'nameOfApp2', 'nameOfApp3'],
 'Key5': ['nameOfApp4'],
 'Key2': ['nameOfApp5'],
 'Key3': ['xxx', 'yyy'],
 'Key4': ['aaa', 'vvv']
]

def expectedValue = 'nameOfApp2'

def key = myMap.find expectedValue in it.value ?.key

assert key == 'Key1'

The variable it inside the predicate closure represents each Map.Entry<String. List<String>> from the input map, so you can check if the expected value is a part of it.value list. And the last part uses ?.key null safe operator to get the value of the key, just in case expected value is not present in any list.

share|improve this answer

edited Mar 8 at 13:52

answered Mar 8 at 13:14

Szymon StepniakSzymon Stepniak

18.9k83566

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks a lot, it works well. I was really close but my knowledges about Groovy are low. Thanks again :)
  
  – Tony Lecointre
  Mar 8 at 13:18
  

  
  
  
  

add a comment | 

You can use find method with a predicate like expectedValue in it.value. Check the following example:

def myMap = [
 'Key1': ['nameOfApp', 'nameOfApp2', 'nameOfApp3'],
 'Key5': ['nameOfApp4'],
 'Key2': ['nameOfApp5'],
 'Key3': ['xxx', 'yyy'],
 'Key4': ['aaa', 'vvv']
]

def expectedValue = 'nameOfApp2'

def key = myMap.find expectedValue in it.value ?.key

assert key == 'Key1'

The variable it inside the predicate closure represents each Map.Entry<String. List<String>> from the input map, so you can check if the expected value is a part of it.value list. And the last part uses ?.key null safe operator to get the value of the key, just in case expected value is not present in any list.

share|improve this answer

edited Mar 8 at 13:52

answered Mar 8 at 13:14

Szymon StepniakSzymon Stepniak

18.9k83566

def myMap = [
 'Key1': ['nameOfApp', 'nameOfApp2', 'nameOfApp3'],
 'Key5': ['nameOfApp4'],
 'Key2': ['nameOfApp5'],
 'Key3': ['xxx', 'yyy'],
 'Key4': ['aaa', 'vvv']
]

def expectedValue = 'nameOfApp2'

def key = myMap.find expectedValue in it.value ?.key

assert key == 'Key1'

share|improve this answer

edited Mar 8 at 13:52

answered Mar 8 at 13:14

Szymon StepniakSzymon Stepniak

18.9k83566

answered Mar 8 at 13:14

Szymon StepniakSzymon Stepniak

18.9k83566

answered Mar 8 at 13:14

Szymon StepniakSzymon Stepniak

18.9k83566