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 Idiomatic approach in Dy is to use non-strict iterators (which can be combined without intermedate data structures) and translate the result to an array if needed:
-<lang Dyalect>func Iterator.Filter(pred) {
+<lang Dyalect>var xs = [1..20]
+var arr = xs.Iterate().Filter(x => x % 2 == 0).Map(x => x.ToString())
-    for x in this when pred(x) {
-        yield x
-    }
-}
-func Iterator.Select(proj) {
-    for x in this {
-        yield proj(x)
-    }
-}
-var xs = [1..20]
-var arr = xs.Iterate().Filter(x => x % 2 == 0).Select(x => x.ToString())
 print(arr.ToArray())</lang>