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

You could invert the map, like this:

Map m = [a: '1', b: '2']
Map mInvert = m.collectEntries { e -> [(e.value): e.key] }

assert mInvert == ['1':'a', '2':'b']

assert mInvert['2'] == 'b'
assert m['b'] == '2'