Groovy - Map intersect(Map right) method

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Description

Groovy Map intersect(Map right) method returns the intersection of both map as a map of common entries.

Syntax

public Map intersect(Map right)

Parameters

right − A Map

Return Value

Map as a intersection of both maps

Example - Getting Intersection of Maps of String and String

Following is an example of the usage of this method −

main.groovy

// define two maps
def map = ["A" : "Apple", "B" : "Banana"] 

def map1 = ["B" : "Banana", "C": "Carrot", "D":"Berry"]

// get intersection of two maps
def result = map.intersect(map1)

println(result)

Output

When we run the above program, we will get the following result −

[B:Banana]

Example - Getting Intersection of Maps of Integer and Integer

Following is an example of the usage of this method −

main.groovy

// define maps
def map = [1 : 11, 2 : 12, 3: 13, 4:14]

def map1 = [2 : 12, 3: 13, 4:14]

// get intersection of two maps
def result = map.intersect(map1)

println(result)

Output

When we run the above program, we will get the following result −

[2:12, 3:13, 4:14]

Example - Getting Intersection of Maps of Integer and Object

Following is an example of the usage of this method −

main.groovy

// define maps
def map = [1 : new Student(1, "Julie"), 2 : new Student(2, "Robert"), 3: new Student(3,"Adam"),4: new Student(4,"Markus")] 

def map1 = [3: new Student(3,"Adam"),4: new Student(4,"Markus")]

// get intersection of two maps
def result = map.intersect(map1)

println(result)

class Student{
   int rollNo
   String name

   Student(int rollNo, String name){
      this.rollNo = rollNo
      this.name = name
   }

   @Override
   public boolean equals(Object obj) {
      Student s = (Student)obj
      return this.rollNo == s.rollNo && this.name.equalsIgnoreCase(s.name)
   }
   
   @Override
   public String toString() {
      return "[ " + this.rollNo + ", " + this.name + " ]"
   }
}

Output

When we run the above program, we will get the following result −

[3:[ 3, Adam ], 4:[ 4, Markus ]]