feat(ch10): add sum reducer

poulzinho · Jan 23, 2020 · fa2396d · fa2396d
1 parent 01e62e0
commit fa2396d
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/src/ch-10_abstraction-and-composition/10.1_abstraction-and-composition.test.js b/src/ch-10_abstraction-and-composition/10.1_abstraction-and-composition.test.js
@@ -25,4 +25,11 @@ describe("Abstraction and Composition", () => {
 
         expect(doubleAll([1, 4, 8])).to.deep.equal([2, 8, 16]);
     });
+
+    it("should use a reducer to sum all terms", () => {
+        const sumReducer = (acc, n) => acc + n;
+        const terms = [2, 4, 5];
+
+        expect(terms.reduce(sumReducer, 0)).to.equal(11);
+    })
 });