add hw2

node_modules/ramda/es/internal/_dropLastWhile.js

@@ -0,0 +1,10 @@
+import slice from "../slice.js";
+export default function dropLastWhile(pred, xs) {
+  var idx = xs.length - 1;
+
+  while (idx >= 0 && pred(xs[idx])) {
+    idx -= 1;
+  }
+
+  return slice(0, idx + 1, xs);
+}