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:
In Dart, a set is a particular instance of a list in which all inputs are unique.
dart:core is required to use this function.
Note: If there are duplicates, then the set will only keep the first instance. For example:
{'Tom','Alsvin','Eddie','Tom'}will result in{'Tom','Alsvin','Eddie'}.
bool set_name.add(element)
// where the set_name is the name of the set.
This function requires an element as a parameter.
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.
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 insertprint("set_1 elements before insert: ${set_1}");//inserting element in setprint("Following element is inserted in the set: ${set_1.add('Eddie')}");//set containing value after insertprint("set_1 elements after insert: ${set_1}");//trying duplicate insertionprint("Following element is inserted in the set: ${set_1.add('Alsvin')}");//set containing value after duplicate insertionprint("set_1 elements after duplicate insertion: ${set_1}");}
Line 4: We create a set with two values {'Tom','Alsvin'} and name it set_1.
Line 9: We add a new element Eddie in set_1 using the add() method.
Line 14: If we try to add a duplicate name i.e., Alsvin, then it simply ignores it and returns the same set.