Added tests and solved invert.js

Author: Konvaly

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 }
+// I think its { key: 1 }
 
 // b) What is the current return value when invert is called with { a: 1, b: 2 }
+// I think it should be { key: 2 }
 
 // c) What is the target return value when invert is called with {a : 1, b: 2}
+// my suggestion is { '1': 'a', '2': 'b' }
 
 // c) What does Object.entries return? Why is it needed in this program?
+// Object.entries returns an array of a given object's own enumerable string-keyed property [key, value] pairs.
+// It is needed in this program to iterate over the key-value pairs of the object to swap them.
 
 // d) Explain why the current return value is different from the target output
+// I think its different because in the line invertedObj.key = value;
+// the key is being set as the string "key" instead of using the variable key.
 
 // e) Fix the implementation of invert (and write tests to prove it's fixed!)

Sprint-2/interpret/invert.test.js

@@ -0,0 +1,38 @@
+const invert = require("./invert.js");
+
+describe("invert", () => {
+  // Given an object with one key-value pair
+  // When invert is called with this object
+  // Then it should return an object with the key and value swapped
+  test("invert swaps key and value for single pair", () => {
+    expect(invert({ a: 1 })).toEqual({ 1: "a" });
+  });
+
+  // Given an object with multiple key-value pairs
+  // When invert is called with this object
+  // Then it should return an object with the keys and values swapped
+  test("invert swaps keys and values for multiple pairs", () => {
+    expect(invert({ a: 1, b: 2 })).toEqual({ 1: "a", 2: "b" });
+  });
+
+  // Given an object with string values
+  // When invert is called with this object
+  // Then it should return an object with the keys and values swapped
+  test("invert swaps keys and values for string values", () => {
+    expect(invert({ x: "apple", y: "banana" })).toEqual({
+      apple: "x",
+      banana: "y",
+    });
+  });
+
+  // Given an object with mixed value types
+  // When invert is called with this object
+  // Then it should return an object with the keys and values swapped
+  test("invert swaps keys and values for mixed value types", () => {
+    expect(invert({ a: 1, b: "two", c: 3 })).toEqual({
+      1: "a",
+      two: "b",
+      3: "c",
+    });
+  });
+});