September 2017 Update

Task/Set/Zkl/set.zkl

@@ -0,0 +1,21 @@
+var [const] unique = Utils.Helpers.listUnique;
+class Set {
+   fcn init { var [const] set = (vm.arglist.copy() : unique(_)) }
+   fcn holds(x) { set.holds(x) }
+   fcn union(setB) { self(set.xplode(),setB.set.xplode()) }
+   fcn intersection(setB){ sb:=setB.set;
+      C:=self(); sc:=C.set;
+      foreach x in (set){ if (sb.holds(x)) sc.append(x) }
+      C
+   }
+   fcn diff(setB){ C:=self(); C.set.extend(set);
+      setB.set.pump(Void,C.set.remove);
+      C
+   }
+   fcn isSubset(setB){ sb:=setB.set;
+      set.pump(Void,'wrap(x){
+         if (not sb.holds(x)) return(Void.Stop,False); True
+      })
+   }
+   fcn __opEQ(setB) { ((set.len() == setB.set.len()) and self.isSubset(setB)) }
+}