ivert function and testing it

Author: Nataliia74

Sprint-2/interpret/invert.js

@@ -10,20 +10,49 @@ function invert(obj) {
   const invertedObj = {};
 
   for (const [key, value] of Object.entries(obj)) {
-    invertedObj.key = value;
+    invertedObj[value] = key;
   }
 
   return invertedObj;
 }
 
+const profile = {
+  name: "Alex",
+  age: 19,
+  occupation: "student",
+};
+
+//console.log(Object.entries(profile));
+//const result = invert(profile);
+//console.log(result);
+
+// 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 e.g. [ [ 'name', 'Alex' ], [ 'age', 19 ], [ 'occupation', 'student' ] ] array of arrays
+// It is needed because we want to iterate through an array to get key and values pars for new 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 function
+// is working improperly. First of all, the key should be taken on brackets to make possible
+// to read every key name-value and value in every pair in subarray.
+// invertedObj.key = value: This is a direct assignment. It treats "key" as a literal string
+// and creates or updates a property named "key" on the invertedObj object, setting its value
+// to the value of the value variable.
+// invertedObj[key] = value: This uses bracket notation. It evaluates the key variable and uses
+// its value (which is a string) as the property name on invertedObj.
+// Secondly, change the key and value places for new object creation statement
+// 'invertedObj[value] = key;' to get swapping the keys and values in the new object.
 
 // 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 +1,58 @@
+const invert = require("./invert.js");
+
+describe("edge cases for invert function", () => {
+  test("given empty object return empty object", () => {
+    const currentOutput = invert({});
+    const targetOutput = {};
+    expect(currentOutput).toEqual(targetOutput);
+  });
+});
+
+test("given one key-value pair", () => {
+  const currentOutput = invert({ age: 6 });
+  const targetOutput = { 6: "age" };
+  expect(currentOutput).toEqual(targetOutput);
+});
+
+test("given non-string key-pair values", () => {
+  const currentOutput = invert({
+    age: 6,
+    married: true,
+    city: undefined,
+    amount: null,
+  });
+  const targetOutput = {
+    6: "age",
+    true: "married",
+    undefined: "city",
+    null: "amount",
+  };
+  expect(currentOutput).toEqual(targetOutput);
+});
+
+test("given non-string key-pair values with spaces or special characters", () => {
+  const currentOutput = invert({
+    age: "1 6",
+    amount: "$67%",
+  });
+  const targetOutput = {
+    "1 6": "age",
+    "$67%": "amount",
+  };
+  expect(currentOutput).toEqual(targetOutput);
+});
+
+test("given complex key-pair values", () => {
+  const currentOutput = invert({
+    age: [1, 5, 8, 6],
+    amount: {
+      berry: 5,
+      vegs: 45,
+    },
+  });
+  const targetOutput = {
+    "1,5,8,6": "age",
+    "[object Object]": "amount",
+  };
+  expect(currentOutput).toEqual(targetOutput);
+});