Dart编程实例 - Typedefs 类型定义

typedef ManyOperation(int firstNo , int secondNo);   //function signature

Add(int firstNo,int second){

   print("Add result is ${firstNo+second}");

}  

Subtract(int firstNo,int second){

   print("Subtract result is ${firstNo-second}");

}  

Divide(int firstNo,int second){

   print("Divide result is ${firstNo/second}");

}  

Calculator(int a,int b ,ManyOperation oper){

   print("Inside calculator");

   oper(a,b);

}  

main(){

   Calculator(5,5,Add);

   Calculator(5,5,Subtract);

   Calculator(5,5,Divide);

}