Manchester | 26-ITP-Jan | Liban Jama | Sprint 2 | Data Groups

Sprint-2/interpret/invert.js

@@ -10,20 +10,22 @@ function invert(obj) {
   const invertedObj = {};
 
   for (const [key, value] of Object.entries(obj)) {
-    invertedObj.key = value;
+    invertedObj[value] = key;
   }
 
   return invertedObj;
 }
-
+// console.log(invert({ a: 1, b: 2 }), "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?
-
+// The Object.entries() static method returns an array of a given object's own enumerable string-keyed property key-value pairs. It returns an array with the object's key-value pairs. e.g. [ [ 'a', 1 ], [ 'b', 2 ] ]
 // d) Explain why the current return value is different from the target output
-
+// This is because the function is not correctly inverting the key and value.
 // e) Fix the implementation of invert (and write tests to prove it's fixed!)
+
+module.exports = invert;

Sprint-2/interpret/invert.test.js

@@ -0,0 +1,16 @@
+const invert = require("../interpret/invert");
+
+test(`Should return {"10": "x", "20": "y"} when given { x: 10, y: 20 } `, () => {
+  expect(invert({ x: 10, y: 20 })).toEqual({ 10: "x", 20: "y" });
+});
+
+test(`Should return {"2": "bounce", "100": "high"} when given { bounce: 2, high: 100 } `, () => {
+  expect(invert({ bounce: 2, high: 100 })).toEqual({
+    2: "bounce",
+    100: "high",
+  });
+});
+
+test(`Should return {"foot": "ball"} when given { "ball": "foot" } `, () => {
+  expect(invert({ ball: "foot" })).toEqual({ foot: "ball" });
+});