Coldfusion: Perks of iterating through structures and arrays using .each()

array-each-basic-example.cfc

   array = ["car", "bike", "foot"];
   array.each(function(item, index) {
       writeOutput(item & " at index: " & index);
   });

different-syntax.cfc

   structEach(struct, function(key, value) {
       writeOutput(key & " = " & value);
   });

   arrayEach(array, function(item, index) {
       writeOutput(item & "at index: " & index);
   });

struct-each-basic-example.cfc

   struct = {
       fieldA = "A",
       fieldB = "B",
       fieldC = "C"
   };
   struct.each(function(key, value) {
       writeOutput(key & " = " & value);
   });

using-each-instead.cfc

   json = getPayload();
   courses = deserializeJson(json); //this returns an array of structs
   maxCourseId = getMaxId();

   courses.each(function(course, index)) {
       importClass(course, maxCourseId + index);
   }

   function importClass(required struct course, required numeric index) {
       queryObject = new query();
       arguments.course.each(function(key, value) {
           queryObject.addParam(name=key, value=value);
       });
      
       //build and execute insert/update query. Here is where we use arguments.index
   }

using-for-in-loops.cfc

   json = getPayload();
   courses = deserializeJson(json); //this returns an array of structs

   for(course in courses) {
       importClass(course);
   }

   function importClass(required struct course) {
	 queryObject = new query(datasource);
	 queryObject.addParam(name="fieldA", value=arguments.course["fieldA"]);
       queryObject.addParam(name="fieldB", value=arguments.course["fieldB"]);
       queryObject.addParam(name="fieldC", value=arguments.course["fieldC"]);
       //build and execute insert/update query
   }