Implement forEach

example/array.usage.cpp

@@ -4,7 +4,7 @@
 using namespace std;
 
 int main() {
-  Array a (10);
+  Array<int> a (10);
 
   for (int i = 0; i < 1000; ++i) a[i] = i;
 

lib/array.h

@@ -61,7 +61,7 @@ class Array {
     return slice[index_in_slice];
   };
 
-  
+
 public:
   int length;
 
@@ -136,6 +136,19 @@ class Array {
   };
 
 
+  // Execute a provided function for
+  // each element in array
+  //   fn - function to be applied
+  //        to each element
+  //
+  void forEach(void (*fn)(T)) {
+    for (int i = 0; i < this->length; ++i) {
+      T item = this->get(i);
+      fn(item);
+    }
+  };
+
+
   // Create string from elements of array
   // separated by specified separator
   //