answered questions and corrected function

Author: mshayriyesaricicek

Sprint-2/interpret/invert.js

@@ -6,24 +6,51 @@
 
 // E.g. invert({x : 10, y : 20}), target output: {"10": "x", "20": "y"}
 
-function invert(obj) {
-  const invertedObj = {};
+//function invert(obj) {
+//  const invertedObj = {};
 
-  for (const [key, value] of Object.entries(obj)) {
-    invertedObj.key = value;
-  }
+//  for (const [key, value] of Object.entries(obj)) {
+//    invertedObj.key = value;
+//  }
 
-  return invertedObj;
-}
+//  return invertedObj;
+//}
 
 // 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 object in pairs [key, value]. It is needed in this program
+  to iterate through the object and access both the key and value at the same time, which is necessary
+   for swapping them in the inverted object. */
 
 // d) Explain why the current return value is different from the target output
 
+/*The current return value is different from the target output because the implementation of the invert 
+function is incorrect. Instead of using the variable key to set the property in the inverted object, 
+it is using the literal string "key". This means that every time a key-value pair is processed, 
+it overwrites the same property "key" in the inverted object, resulting in only the last key-value 
+pair being stored. To fix this, we need to use bracket notation to set the property in the inverted object 
+using the value as the key and the key as the value.*/
+
 // 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;
+}
+
+console.log(invert({ a: 1 })); // { "1": "a" }
+console.log(invert({ a: 1, b: 2 })); // { "1": "a", "2": "b" }
+console.log(invert({ x: 10, y: 20 })); // { "10": "x", "20": "y" }