Finding the key in a map, given the value

Question

Hi I have a map like this :

[this:0, is:1, a:2, file:3, anotherkey:4, aa:5]

I wish I could find the key\'s given the value

Answer 1

There's no specific command for that.

Fortunately, as showed here, you can easily get the key(s) for a specific value in a map:

def myMap = [this:0, is:1, a:2, file:3, fix:4, aa:5]
def myValue = 5

You can do:

def myKey = myMap.find{ it.value == myValue }?.key
// 'aa'

If you want all the keys, do something like this:

def myMap = [this:0, is:1, a:2, file:3, fix:4, aa:5, bb:5]
def myValue = 5

def myKeys = []
myMap.findAll{ it.value == myValue }.each{myKeys << it?.key}
// ['aa', 'bb']