Groovy: Adding elements to the map

Groovy provides below ways to add elements to the map.

a.   Using put method

b.   Using putAll method

c.    Using subscript operator

Using put method

HelloWorld.groovy

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

printMap(countryCapitals)

println "\nAdding two more country details\n"

countryCapitals.put('Colombia', 'Bogota')
countryCapitals.put('Libya', 'Tripoli')

printMap(countryCapitals)

void printMap(map){
 map.eachWithIndex {entry, i -> 
  println "$i : CountryName: $entry.key, Capital: $entry.value"
 }
}

Output

0 : CountryName: India, Capital: new Delhi

1 : CountryName: Australia, Capital: Canberra

Adding two more country details

0 : CountryName: India, Capital: new Delhi

1 : CountryName: Australia, Capital: Canberra

2 : CountryName: Colombia, Capital: Bogota

3 : CountryName: Libya, Capital: Tripoli

Using putAll method

putAll method used to copy the elements from one map to this map.

HelloWorld.groovy

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

def tempCountries = ['Colombia' : 'Bogota', 'Libya':'Tripoli']

printMap(countryCapitals)

println "\nAdding two more country details\n"

countryCapitals.putAll(tempCountries)

printMap(countryCapitals)

void printMap(map){
 map.eachWithIndex {entry, i -> 
  println "$i : CountryName: $entry.key, Capital: $entry.value"
 }
}

Output

0 : CountryName: India, Capital: new Delhi

1 : CountryName: Australia, Capital: Canberra

Adding two more country details

0 : CountryName: India, Capital: new Delhi

1 : CountryName: Australia, Capital: Canberra

2 : CountryName: Colombia, Capital: Bogota

3 : CountryName: Libya, Capital: Tripoli

Using subscript operator

countryCapitals['Colombia'] = 'Bogota'

countryCapitals['Libya'] = 'Tripoli'

HelloWorld.groovy

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

printMap(countryCapitals)

println "\nAdding two more country details\n"

countryCapitals['Colombia'] = 'Bogota'
countryCapitals['Libya'] = 'Tripoli'

printMap(countryCapitals)

void printMap(map){
 map.eachWithIndex {entry, i -> 
  println "$i : CountryName: $entry.key, Capital: $entry.value"
 }
}

Output

0 : CountryName: India, Capital: new Delhi

1 : CountryName: Australia, Capital: Canberra

Adding two more country details

0 : CountryName: India, Capital: new Delhi

1 : CountryName: Australia, Capital: Canberra

2 : CountryName: Colombia, Capital: Bogota

3 : CountryName: Libya, Capital: Tripoli

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