interpret and fixed the invert function

Author: Ebrahim-Moqbel

Sprint-2/interpret/invert.js

@@ -5,7 +5,7 @@
 // Then it should swap the keys and values in the object
 
 // E.g. invert({x : 10, y : 20}), target output: {"10": "x", "20": "y"}
-
+/*
 function invert(obj) {
   const invertedObj = {};
 
@@ -15,15 +15,29 @@ function invert(obj) {
 
   return invertedObj;
 }
-
+console.log(invert({a:1,b:2}))*/
 // 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?
-
+// It returns an array of [key,value] pairs as two elements array and was used to return the object into enumerable array 
 // d) Explain why the current return value is different from the target output
-
+// the function contain a bug as the dot notation here was overwriting the object in the loop also the return is not swapping the input
 // e) Fix the implementation of invert (and write tests to prove it's fixed!)
+
+function invert(obj) {
+
+
+  const invertedObj = {};
+
+  for (const [key, value] of Object.entries(obj)) {
+    invertedObj[value] = key;
+  }
+
+  return invertedObj;
+}
+
+module.exports =invert

Sprint-2/interpret/invert.test.js

@@ -0,0 +1,13 @@
+const invert = require("./invert.js")
+
+test('given an empty object , returns an empty object', () => {
+    expect(invert({})).toEqual({})
+})
+
+test('Given an object with a single pair swaps ', () => {
+    expect(invert({ a: "hello" })).toEqual({ "hello": "a" })
+})
+
+test('given an object with more than two pairs swaps the keys and values ', () => {
+    expect(invert({ a: 1, b: 2 })).toEqual({ 1: "a", 2: "b" })
+})