Completed exercise in interpret

Author: A-Moiz

Sprint-2/interpret/invert.js

@@ -10,20 +10,28 @@ function invert(obj) {
   const invertedObj = {};
 
   for (const [key, value] of Object.entries(obj)) {
-    invertedObj.key = value;
+    invertedObj[value] = key;
   }
 
   return invertedObj;
 }
 
+module.exports = invert;
+
 // a) What is the current return value when invert is called with { a : 1 }
+// { key: 1 }
 
 // b) What is the current return value when invert is called with { a: 1, b: 2 }
+// { key: 2 }
 
 // c) What is the target return value when invert is called with {a : 1, b: 2}
+// {"1": "a", "2": "b"}
 
 // c) What does Object.entries return? Why is it needed in this program?
+// Object.entries returns an array of the key value pairs in an object
+// It is needed because without it, iterating over the object is not possible
 
 // d) Explain why the current return value is different from the target output
+// InvertedObj.key creates a key called 'key' in the object
 
 // e) Fix the implementation of invert (and write tests to prove it's fixed!)

Sprint-2/interpret/invert.test.js

@@ -0,0 +1,23 @@
+const invert = require("./invert");
+
+describe("invert", () => {
+  test("object with numbers as values", () => {
+    expect(invert({ a: 1, b: 2 })).toEqual({ 1: "a", 2: "b" });
+  });
+
+  test("1 pair in object", () => {
+    expect(invert({ x: 99 })).toEqual({ 99: "x" });
+  });
+
+  test("number keys with string values", () => {
+    expect(invert({ 1: "one", 2: "two" })).toEqual({ one: "1", two: "2" });
+  });
+
+  test("empty object returns empty object", () => {
+    expect(invert({})).toEqual({});
+  });
+
+  test("mixed types", () => {
+    expect(invert({ a: 1, b: "hello" })).toEqual({ 1: "a", hello: "b" });
+  });
+});