The **`set.isEmpty` function** in Dart is used to check if a set is empty. The `set.isEmpty` function returns `true` if the set is empty. Otherwise, it returns `false`. 

The illustration below shows the visual representation of the `set.isEmpty` function.

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> In Dart, a **`set`** is a particular instance in a list in which all of the inputs are unique.
>
> `dart:core` is required in order to use this function.
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# 
#  Syntax

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```dart
bool set_name.isEmpty
```
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>  `set_name` is the name of the set.
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# 
#  Parameters

The `set.isEmpty` function does not require any parameters.

##
## Return value

If the set is empty, the `set.isEmpty` function returns `true`. Otherwise, it returns `false`.

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> If there are duplicates, then the set will only keep the first instance, i.e.,
`{'Tom','Alsvin','Eddie','Tom'}` will result in `{'Tom','Alsvin','Eddie'}`.

##
## Code

The code below shows how to use the `set.isEmpty` function in Dart.

import 'dart:convert';
import 'dart:core';

void main() {

  Set<String> set_1 = {'Tom','Alsvin','Eddie'}; 
  
  //set containing unique value
  print("set_1 is empty: ${set_1.isEmpty}");

  //empty set
  Set<String> set_2 = {};
  print("set_2 is empty: ${set_2.isEmpty}");

  //set containing non-unique value
  Set<String> set_3 = {'Tom','Alsvin','Eddie','Tom'}; 
  print("set_3 is empty: ${set_3.isEmpty}");

}

What is the set.isEmpty method in Dart?

The set.isEmpty function in Dart checks if a set is empty, returning true if it is and false otherwise.