@@ -0,0 +1,56 @@
+'use strict';
+
+class Adder {
+  constructor(type, reducer) {
+    this.type = type;
+    this.reducer = reducer;
+    this.next = null;
+  }
+}
+
+class Chain {
+  constructor() {
+    this.first = null;
+    this.last = null;
+  }
+
+  add(adder) {
+    if (!this.first) this.first = adder;
+    else this.last.next = adder;
+    this.last = adder;
+    return this;
+  }
+
+  process(collection) {
+    let adder = this.first;
+    do {
+      if (collection instanceof adder.type) {
+        return adder.reducer(collection);
+      }
+      adder = adder.next;
+    } while (adder);
+    throw new Error('Unsupported collection type');
+  }
+}
+
+// Usage
+
+const sum = (a, b) => a + b;
+
+const chain = new Chain()
+  .add(new Adder(Array, array => array.reduce(sum)))
+  .add(new Adder(Set, set => [...set].reduce(sum)))
+  .add(new Adder(Uint8Array, u8a => Array.from(u8a).reduce(sum)))
+  .add(new Adder(Object, obj => `Not supported ${obj.constructor.name}`));
+
+const sum1 = chain.process([1, 2, 3]);
+console.dir({ sum1 });
+
+const sum2 = chain.process(new Set([1, 2, 3]));
+console.dir({ sum2 });
+
+const sum3 = chain.process(new Uint8Array([1, 2, 3]));
+console.dir({ sum3 });
+
+const sum4 = chain.process(new Int32Array([1, 2, 3]));
+console.dir({ sum4 });