complete-interpret-exercises

Author: Elisabeth-Matulian

Sprint-2/interpret/invert.js

@@ -10,20 +10,30 @@ function invert(obj) {
   const invertedObj = {};
 
   for (const [key, value] of Object.entries(obj)) {
-    invertedObj.key = value;
+    invertedObj[value] = key;
   }
 
   return invertedObj;
 }
 
+
 // a) What is the current return value when invert is called with { a : 1 }
+// invertedObj.key = value; this line creates a key literally with name "key". it returns {key : 1}
 
 // b) What is the current return value when invert is called with { a: 1, b: 2 }
+// every time it meets the key and reassign it, so {key : 2}
 
 // c) What is the target return value when invert is called with {a : 1, b: 2}
+// to swap pair key-value with each other. should return {1 : a, 2: b}
 
 // c) What does Object.entries return? Why is it needed in this program?
+// it returns key-value pairs in arrays nested of array. we need Object.entries to convert key-value pairs to array because for..of doesn't work with objects. 
+//I wonder if we could solve the function by swapping key-value using [key, value] = [value, key] in some way? p.s. I'll delete this comment after review:)
 
 // d) Explain why the current return value is different from the target output
+// invertedObj.key = value; this line creates a key literally with name "key". it returns {key : 1}
 
 // 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 +1,6 @@
+const invert = require("./invert.js");
+
+
+test(" should return an object with swapped keys and values", () => {
+    expect(invert({"a" : "1", "b": "2"})).toEqual({"1" : "a", "2" : "b"});
+});