Dart – Anonymous Functions

Last Updated : 15 Jul, 2020

An anonymous function in Dart is like a named function but they do not have names associated with it. An anonymous function can have zero or more parameters with optional type annotations. An anonymous function consists of self-contained blocks of code and that can be passed around in our code as a function parameter.

In Dart most of the functions are named functions we can also create nameless function knows as an anonymous function, lambda, or closure.
In Dart we can assign an anonymous function to constants or variables, later we can access or retrieve the value of closure based on our requirements:

Syntax:

(parameter_list)

{

statement(s)

}

Example:

Dart

// Dartprogram to illustrate  
// Anonymous functions in Dart 
void main() 
{ 
  var list = ["Shubham","Nick","Adil","Puthal"]; 
  print("GeeksforGeeks - Anonymous function in Dart"); 
  list.forEach((item) { 
    print('${list.indexOf(item)} : $item'); 
  }); 
}

Output:

This example defines an anonymous function with an untyped parameter, item. The function, invoked for each item in the list, prints a string that includes the value at the specified index.