Perfect numbers: Difference between revisions

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 </pre>
 =={{header|Elena}}==
-ELENA 3.4:
+ELENA 4.x:
-<lang elena>import system'routines.
+<lang elena>import system'routines;
-import system'math.
+import system'math;
-import extensions.
+import extensions;
 extension extension
 {
-    isPerfect
+    isPerfect()
-        = 1 till:self repeat(:n)( (self mod:n == 0) iif(n,0) ); summarize(Integer new) == self.
+        = new Range(1, self - 1).selectBy:(n => (self.mod:n == 0).iif(n,0) ).summarize(new Integer()) == self;
 }
-public program
+public program()
+{
-[
-till:10000 do(:n)
+    for(int n := 1, n < 10000, n += 1)
-    [
+    {
-        if(n isPerfect)
+        if(n.isPerfect())
-            [ console printLine(n," is perfect") ]
+            { console.printLine(n," is perfect") }
-    ].
+    };
-    console readChar
+    console.readChar()
-]</lang>
+}</lang>
 {{out}}
 <pre>