Groovy: Keys in the map are string by default

Keys in the map are string by default. Let me confirm this with below example.

HelloWorld.groovy

def countryCapitals = [India : "new Delhi", Australia : "Canberra"]

indiaCapital = countryCapitals.get('India')
australiaCapital = countryCapitals['Australia']

println "indiaCapital : $indiaCapital"
println "australiaCapital : $australiaCapital"

Output

indiaCapital : new Delhi

australiaCapital : Canberra

How can you make the value of particular variable 'x' as the key to the map?

You can do this by escaping the key adding parenthesis.

HelloWorld.groovy

def x = "India"
def y = "Australia"

def countryCapitals = [(x) : "new Delhi", (y) : "Canberra"]

indiaCapital = countryCapitals.get('India')
australiaCapital = countryCapitals['Australia']

println "indiaCapital : $indiaCapital"
println "australiaCapital : $australiaCapital"

Output

indiaCapital : new Delhi
australiaCapital : Canberra

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