What is the set.add() method in Dart?

Overview

The set.add() function in Dart is used to insert an element in the set.

The image below shows the visual representation of the set.add() function:

Syntax

bool set_name.add(element)
// where the set_name is the name of the set.

Parameter

This function requires an element as a parameter.

Return value

This function inserts the element sent as a parameter in the set.

It returns true if the element is not present in the set already, otherwise returns false.

Code

The code below shows how to use the set.add() function in Dart:

import 'dart:convert';
import 'dart:core';
void main() {
  Set<String> set_1 = {'Tom','Alsvin'}; 
  //set containing value before insert
  print("set_1 elements before insert: ${set_1}");
  //inserting element in set
  print("Following element is inserted in the set: ${set_1.add('Eddie')}");
  //set containing value after insert
  print("set_1 elements after insert: ${set_1}");
  //trying duplicate insertion
  print("Following element is inserted in the set: ${set_1.add('Alsvin')}");
  //set containing value after duplicate insertion
  print("set_1 elements after duplicate insertion: ${set_1}");
}