Groovy - List intersect(Iterable iterable) method

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Description

Groovy List intersect(Iterable iterable) method Returns the list of items which are common in current list and passed iterable. By default it uses NumberAwareComparator while determining if an element exists in both collections.

Syntax

public List intersect(Iterable right)

Parameters

right − an iterable

Return Value

A List as result of intersection between current List and Iterable passed.

Example - Getting common values from a Lists of Integers

Following is an example of the usage of this method −

main.groovy

def lst = [11, 12, 13, 14, 15]
def otherLst = [16, 12, 13, 14, 17]

println(lst.intersect(otherLst))

Output

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

[12, 13, 14]

Example - Getting common values from a Lists of Strings

Following is an example of the usage of this method −

main.groovy

def lst = ["Apple","Mango","Orange", "Papaya", "Peach"]
def otherLst = ["Papaya", "Orange","Grapes"]

println(lst.intersect(otherLst))

Output

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

[Papaya, Orange]

Example - Getting common values from a Lists of Objects

Following is an example of the usage of this method −

main.groovy

def lst = [new Student(1, "Julie"),new Student(2, "Robert"),new Student(3, "Adam")];

def otherLst = [new Student(1, "Julie"),new Student(2, "Robert"),new Student(4, "Markel")];

println(lst.intersect(otherLst))

class Student implements Comparable {
   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 + " ]";
   }
   
   public int compareTo(Object obj){
      Student s = (Student)obj;
      return this.rollNo - s.rollNo   
   }
}

Output

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

[[ 1, Julie ], [ 2, Robert ]]