Dart: Typedef Keyword

Typedef in Dart is used to create a user-defined identity (alias) for a function, and we can use that identity in place of the function in the program code. When we use typedef we can define the parameters of the function.

Syntax: typedef varibale_name= return_type function_name ( parameters );

Example:

typedef Temp(int a);

First(int a){
  print('First function: ${a+1}');
}

Second(int a){
  print('Second Function: ${a+2}');
}

void main(){
  Temp x= First;
  x(5); //Output: First function: 5

  x=Second;
  x(6); //Output: Second function: 6
}

Conclusion:

Using typedef helps make your code more expressive, especially when dealing with complex function types, such as callbacks or event handlers. It enhances code readability and makes it easier to understand the intent of the code.