Time for action – Applying a function on every item

We are going to create a function that will take a function and apply it to every item in a list. We are going to use it to simply display every Int in a list.

1. At first, let's create a function that takes an Int and displays it:

   class Main
   {
   
      public static function main()
      {
      }
      
      public static function displayInt(i : Int)
      {
         trace(i);
      }
   }

2. Then in our Main class add a list of Int:

   class Main
   {
      public static var intList : List<Int>;public static function main()
      {
      intList = new List<Int>(); //Initialize the variable
      }
   }

3. Note that we have to initialize the list in the main function.

4. Now, let's create the function that will iterate over the list, as follows:

      public static function iterateAndApply(fun : Int->Void) : Void
      {
         for(i in intList)
         {
            fun(i);
         }
      }

5. Now, we can simply call this function, as follows:

   iterateAndApply(displayInt)

What just happened?

We created an iterateAndApply...