Groovy - List drop(int num) method

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Description

Groovy List drop(int num) method drops the given number of elements from the head of the list and returns the remaining items. In list has less number of items, empty list is returned.

Syntax

public List drop(int num)

Parameters

num − number of items to be dropped from the head of the list.

Return Value

A list of items minus the num items.

Example - Dropping first two number from a List of Integers

Following is an example of the usage of this method −

main.groovy

def lst = [11, 12, 13, 14, 15]

// get remaining items after dropping first two elements
remainingItems = lst.drop(2)
println(remainingItems)

// original list is intact
println(lst)

Output

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

[13, 14, 15]
[11, 12, 13, 14, 15]

Example - Dropping first two strings from a List of Strings

Following is an example of the usage of this method −

main.groovy

def lst = ["Apple","Mango","Orange","Papaya"]

// get remaining items after dropping first two elements
remainingItems = lst.drop(2)
println(remainingItems)

// original list is intact
println(lst)

Output

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

[Orange, Papaya]
[Apple, Mango, Orange, Papaya]

Example - Dropping first two objects from a List 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")];

// get remaining items after dropping first two elements
remainingItems = lst.drop(2)
println(remainingItems)

// original list is intact
println(lst)

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, Adam ]]
[[ 1, Julie ], [ 2, Robert ], [ 3, Adam ]]