What is the set.contains() method in Dart?
The set.contains() function in Dart is used to check if a set contains the specific element sent as a parameter.
set.contains()returnstrueif the set contains that element. Otherwise, it returnsfalse.
Figure below, shows a visual representation of the set.contains() function:
In Dart, a
setis a particular instance of a list in which all of the elements are unique.
dart:corelibrary is required in order to use this function.
If there are duplicates, then the set will only keep the first instance/element. For example,
{'Tom','Alsvin','Eddie','Tom'}will result in{'Tom','Alsvin','Eddie'}.
Syntax
bool set_name.contains(element)
// where the set_name is the name of the set.
Parameter
This function requires an element as a parameter.
Return value
The function returns a Boolean value, i.e., true if a specific element is present in a set or false if it is not present.
Code
The code below shows how to use the set.contains() function in Dart:
import 'dart:convert';import 'dart:core';void main() {Set<String> set_1 = {'Tom','Alsvin','Eddie'};//set containing valueprint("set_1 elements: ${set_1}");//set containing specific elementprint("Eddie is present in the set: ${set_1.contains('Eddie')}");//set not containing specific elementprint("Jack element is present in the set: ${set_1.contains('Jack')}");}
