diff --git a/Sprint-2/debug/address.js b/Sprint-2/debug/address.js
index 940a6af83..1193eacca 100644
--- a/Sprint-2/debug/address.js
+++ b/Sprint-2/debug/address.js
@@ -1,5 +1,5 @@
 // Predict and explain first...
-
+//will log undefined , there is no "0" key, objects do not have indexes so we can't use [0]
 // This code should log out the houseNumber from the address object
 // but it isn't working...
 // Fix anything that isn't working
@@ -12,4 +12,4 @@ const address = {
   postcode: "XYZ 123",
 };
 
-console.log(`My house number is ${address[0]}`);
+console.log(`My house number is ${address.houseNumber}`);//or ["houseNumber"]
diff --git a/Sprint-2/debug/author.js b/Sprint-2/debug/author.js
index 8c2125977..592a83087 100644
--- a/Sprint-2/debug/author.js
+++ b/Sprint-2/debug/author.js
@@ -1,5 +1,5 @@
 // Predict and explain first...
-
+// it comes out of the loop after the first console.log
 // This program attempts to log out all the property values in the object.
 // But it isn't working. Explain why first and then fix the problem
 
@@ -11,6 +11,6 @@ const author = {
   alive: true,
 };
 
-for (const value of author) {
-  console.log(value);
+for (const value in author) {
+  console.log(`${value}:${author[value]}`);
 }
diff --git a/Sprint-2/debug/recipe.js b/Sprint-2/debug/recipe.js
index 6cbdd22cd..42dd9f549 100644
--- a/Sprint-2/debug/recipe.js
+++ b/Sprint-2/debug/recipe.js
@@ -1,5 +1,5 @@
 // Predict and explain first...
-
+//it will log everything in one line, we need to add \n
 // This program should log out the title, how many it serves and the ingredients.
 // Each ingredient should be logged on a new line
 // How can you fix it?
@@ -10,6 +10,8 @@ const recipe = {
   ingredients: ["olive oil", "tomatoes", "salt", "pepper"],
 };
 
-console.log(`${recipe.title} serves ${recipe.serves}
-  ingredients:
-${recipe}`);
+console.log(`${recipe.title}, serves ${recipe.serves}, ingredients:`);
+
+for (const ingredient of recipe.ingredients) {
+  console.log(ingredient);
+}
diff --git a/Sprint-2/implement/contains.js b/Sprint-2/implement/contains.js
index cd779308a..ce68fb81d 100644
--- a/Sprint-2/implement/contains.js
+++ b/Sprint-2/implement/contains.js
@@ -1,3 +1,16 @@
-function contains() {}
+function contains(obj, property) {
+  if (typeof obj !== "object" || obj === null || Array.isArray(obj)) {
+    throw new Error("Parameter is not an object literal");
+  }
+  if (Object.keys(obj).length === 0) {
+    return false;
+  }
+
+  if (property in obj) {
+    return true;
+  }
+
+  return false;
+}
 
 module.exports = contains;
diff --git a/Sprint-2/implement/contains.test.js b/Sprint-2/implement/contains.test.js
index 326bdb1f2..6565d518e 100644
--- a/Sprint-2/implement/contains.test.js
+++ b/Sprint-2/implement/contains.test.js
@@ -16,16 +16,32 @@ as the object doesn't contains a key of 'c'
 // Given a contains function
 // When passed an object and a property name
 // Then it should return true if the object contains the property, false otherwise
+test("if the object contains the property, return 'true'", () => {
+  expect(contains({ a: 1 }, "a")).toEqual(true);
+});
+test("if the object contains the property, return 'true'", () => {
+  expect(contains({ a: 1, "a,s,3": "op" }, ["a", "s", 3])).toEqual(true);
+});
+
+test("if the object doesn't contain the property return 'false'", () => {
+  expect(contains({ a: 1, d: 7 }, "m")).toEqual(false);
+});
+test("if the object doesn't contain the property return 'false'", () => {
+  expect(contains({ a: 1, s: 7 }, [1, 2, "a"])).toEqual(false);
+});
 
 // Given an empty object
 // When passed to contains
 // Then it should return false
-test.todo("contains on empty object returns false");
+test("contains an empty object returns false", () => {
+  expect(contains({}, "a")).toEqual(false);
+});
 
 // Given an object with properties
 // When passed to contains with an existing property name
 // Then it should return true
 
+//<<<both covered already>>
 // Given an object with properties
 // When passed to contains with a non-existent property name
 // Then it should return false
@@ -33,3 +49,6 @@ test.todo("contains on empty object returns false");
 // Given invalid parameters like an array
 // When passed to contains
 // Then it should return false or throw an error
+test("when instead of an object literal the parameter is an array throw error", () => {
+  expect(() => contains([], "a")).toThrow("Parameter is not an object literal");
+});
diff --git a/Sprint-2/implement/lookup.js b/Sprint-2/implement/lookup.js
index a6746e07f..fd3a85055 100644
--- a/Sprint-2/implement/lookup.js
+++ b/Sprint-2/implement/lookup.js
@@ -1,5 +1,18 @@
-function createLookup() {
-  // implementation here
+function createLookup(countryCurrency) {
+  let countryCurrencyPairs = {};
+  for (const pair of countryCurrency) {
+    let country = pair[0];
+    let currency = pair[1];
+    countryCurrencyPairs[country] = currency;
+  }
+  return countryCurrencyPairs;
 }
+console.log(
+  createLookup([
+    ["US", "USD"],
+    ["CA", "CAD"],
+    ["RO", "RON"],
+  ])
+);
 
 module.exports = createLookup;
diff --git a/Sprint-2/implement/lookup.test.js b/Sprint-2/implement/lookup.test.js
index 547e06c5a..d401513f3 100644
--- a/Sprint-2/implement/lookup.test.js
+++ b/Sprint-2/implement/lookup.test.js
@@ -1,6 +1,14 @@
 const createLookup = require("./lookup.js");
 
-test.todo("creates a country currency code lookup for multiple codes");
+test("creates a country currency code lookup for multiple codes", () => {
+  expect(
+    createLookup([
+      ["US", "USD"],
+      ["CA", "CAD"],
+      ["RO", "RON"],
+    ])
+  ).toEqual({ US: "USD", CA: "CAD", RO: "RON" });
+});
 
 /*
 
diff --git a/Sprint-2/implement/querystring.js b/Sprint-2/implement/querystring.js
index 45ec4e5f3..0a93c3551 100644
--- a/Sprint-2/implement/querystring.js
+++ b/Sprint-2/implement/querystring.js
@@ -3,14 +3,30 @@ function parseQueryString(queryString) {
   if (queryString.length === 0) {
     return queryParams;
   }
+
   const keyValuePairs = queryString.split("&");
 
   for (const pair of keyValuePairs) {
-    const [key, value] = pair.split("=");
-    queryParams[key] = value;
+    if(pair===""){
+      continue
+    }
+    const equalIndex=pair.indexOf("=")
+    if (equalIndex === -1) {
+      queryParams[pair]="";
+      continue
+    }
+    const key=pair.substring(0,equalIndex)
+    const value=pair.substring(equalIndex+1)
+    queryParams[key]=value
+    
   }
 
   return queryParams;
 }
+//console.log(parseQueryString("equationxy+1"));
 
 module.exports = parseQueryString;
+
+
+
+
diff --git a/Sprint-2/implement/querystring.test.js b/Sprint-2/implement/querystring.test.js
index 3e218b789..20eac2231 100644
--- a/Sprint-2/implement/querystring.test.js
+++ b/Sprint-2/implement/querystring.test.js
@@ -3,10 +3,52 @@
 // Below is one test case for an edge case the implementation doesn't handle well.
 // Fix the implementation for this test, and try to think of as many other edge cases as possible - write tests and fix those too.
 
-const parseQueryString = require("./querystring.js")
+const parseQueryString = require("./querystring.js");
 
 test("parses querystring values containing =", () => {
-  expect(parseQueryString("equation=x=y+1")).toEqual({
-    "equation": "x=y+1",
+  expect(parseQueryString("equation=x=y+1")).toEqual({ equation: "x=y+1" });
+});
+
+test("parse querystring with multiple values", () => {
+  expect(parseQueryString("equation=x=y+1&sound=none")).toEqual({
+    equation: "x=y+1",
+    sound: "none",
   });
 });
+
+test("parse querystring with multiple ==", () => {
+  expect(parseQueryString("equation==x=y+1&sound=none")).toEqual({
+    equation: "=x=y+1",
+    sound: "none",
+  });
+});
+
+test("parse querystring with multiple &&", () => {
+  expect(parseQueryString("equation=x=y+1&&sound=none")).toEqual({
+    equation: "x=y+1",
+    sound: "none",
+  });
+});
+
+test("parse querystring with no =", () => {
+  expect(parseQueryString("equation=x=y+1&soundnone")).toEqual({
+    equation: "x=y+1",
+    soundnone:"",
+  });
+});
+
+//don't know how to do this
+// test("parse querystring with multiple ==", () => {
+//   expect(parseQueryString("equation==x=y+1&sound=none")).toEqual({
+//     equation=: "x=y+1",
+//     sound: "none",
+//   });
+// });
+
+//don't know how to do this
+// test("parses querystring values containing &", () => {
+//   expect(parseQueryString("&equation=x=y+1&sound=none")).toEqual({
+//     "&equation": "x=y+1",
+//     sound: "none",
+//   });
+// });
diff --git a/Sprint-2/implement/tally.js b/Sprint-2/implement/tally.js
index f47321812..6ed7f6ec5 100644
--- a/Sprint-2/implement/tally.js
+++ b/Sprint-2/implement/tally.js
@@ -1,3 +1,17 @@
-function tally() {}
+function tally(arr) {
+const objectCount={}
+if(!Array.isArray(arr)){
+    throw new Error("Invalid input");
+}
+if(arr.length===0){
+    return {}
+}
+for(const element of arr){
+    objectCount[element]=objectCount[element] ? objectCount[element] +1:1;
+}
+return objectCount
+
+}
+
 
 module.exports = tally;
diff --git a/Sprint-2/implement/tally.test.js b/Sprint-2/implement/tally.test.js
index 2ceffa8dd..a68e13ec4 100644
--- a/Sprint-2/implement/tally.test.js
+++ b/Sprint-2/implement/tally.test.js
@@ -19,16 +19,27 @@ const tally = require("./tally.js");
 // Given a function called tally
 // When passed an array of items
 // Then it should return an object containing the count for each unique item
+test("on an array of items returns an object containing the count for each unique item ", () => {
+  expect(tally(["a", "a", "a", "h"])).toEqual({ a: 3, h: 1 });
+});
 
 // Given an empty array
 // When passed to tally
 // Then it should return an empty object
-test.todo("tally on an empty array returns an empty object");
+test("tally on an empty array returns an empty object", () => {
+  expect(tally([])).toEqual({});
+});
 
 // Given an array with duplicate items
 // When passed to tally
 // Then it should return counts for each unique item
+test("on an array of items returns an object containing the count for each unique item ", () => {
+  expect(tally([1,1,4,4,4,4])).toEqual({ 1: 2, 4: 4 });
+});
 
 // Given an invalid input like a string
 // When passed to tally
 // Then it should throw an error
+test("given invalid input , throw error",()=>{
+    expect(() => tally("hello")).toThrow("Invalid input");
+})
diff --git a/Sprint-2/interpret/invert.js b/Sprint-2/interpret/invert.js
index bb353fb1f..59705c738 100644
--- a/Sprint-2/interpret/invert.js
+++ b/Sprint-2/interpret/invert.js
@@ -10,20 +10,26 @@ 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 }
+//["a",1]
 
 // b) What is the current return value when invert is called with { a: 1, b: 2 }
+//[[ "a", 1], ["b", 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?
+//returns an array so we can access each element of it so we can swap their order
 
 // d) Explain why the current return value is different from the target output
+//it creates a new key:value pair with the key being "key",also it doesnt invert the key with the value
 
 // e) Fix the implementation of invert (and write tests to prove it's fixed!)
+module.exports = invert;
diff --git a/Sprint-2/interpret/invert.test.js b/Sprint-2/interpret/invert.test.js
new file mode 100644
index 000000000..c0e0db0b6
--- /dev/null
+++ b/Sprint-2/interpret/invert.test.js
@@ -0,0 +1,4 @@
+const invert = require("./invert.js");
+test("swap the keys and values in the object", () => {
+  expect(invert({ a: 1, asd: "d3e" })).toEqual({ 1: "a", d3e: "asd" });
+});