diff --git a/.vscode/jsconfig.json b/.vscode/jsconfig.json
new file mode 100644
index 000000000..e9441a490
--- /dev/null
+++ b/.vscode/jsconfig.json
@@ -0,0 +1,8 @@
+{
+    "compilerOptions": {
+        "target": "esnext",
+        "lib": [
+            "esnext"
+        ]
+    }
+}
\ No newline at end of file
diff --git a/.vscode/main.js b/.vscode/main.js
new file mode 100644
index 000000000..ec3bef502
--- /dev/null
+++ b/.vscode/main.js
@@ -0,0 +1,12 @@
+/// <reference path="c:/Users/tekre/.vscode/extensions/nur.script-0.2.1/@types/api.global.d.ts" />
+/// <reference path="c:/Users/tekre/.vscode/extensions/nur.script-0.2.1/@types/vscode.global.d.ts" />
+//  @ts-check
+//  API: https://code.visualstudio.com/api/references/vscode-api
+
+function activate(_context) {
+   window.showInformationMessage('Hello, World!');
+}
+
+function deactivate() {}
+
+module.exports = { activate, deactivate }
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 000000000..6c2ff60b6
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,5 @@
+{
+    "githubPullRequests.ignoredPullRequestBranches": [
+        "master"
+    ]
+}
\ No newline at end of file
diff --git a/exercises/B-hello-world/exercise.js b/exercises/B-hello-world/exercise.js
index b179ee953..a0472ee47 100644
--- a/exercises/B-hello-world/exercise.js
+++ b/exercises/B-hello-world/exercise.js
@@ -1 +1,3 @@
 console.log("Hello world");
+console.log("Hello World. I just started learning JavaScript");
+console.log(33);
diff --git a/exercises/C-variables/exercise.js b/exercises/C-variables/exercise.js
index a6bbb9786..7beea3261 100644
--- a/exercises/C-variables/exercise.js
+++ b/exercises/C-variables/exercise.js
@@ -1,3 +1,5 @@
 // Start by creating a variable `greeting`
-
+var greeting = "Hello world";
+console.log(greeting);
+console.log(greeting);
 console.log(greeting);
diff --git a/exercises/D-strings/exercise.js b/exercises/D-strings/exercise.js
index 2cffa6a81..8eb3e774b 100644
--- a/exercises/D-strings/exercise.js
+++ b/exercises/D-strings/exercise.js
@@ -1,3 +1,9 @@
 // Start by creating a variable `message`
 
+
+var message = "This is a string";
+var messageType = typeof message;
+
+
 console.log(message);
+console.log(messageType);
diff --git a/exercises/E-strings-concatenation/exercise.js b/exercises/E-strings-concatenation/exercise.js
index 2cffa6a81..dca8c2558 100644
--- a/exercises/E-strings-concatenation/exercise.js
+++ b/exercises/E-strings-concatenation/exercise.js
@@ -1,3 +1,8 @@
 // Start by creating a variable `message`
 
-console.log(message);
+var greetingStart = "Hello, my name is ";
+var name = "Ekrem";
+
+var greeting = greetingStart + name;
+
+console.log(greeting);
diff --git a/exercises/F-strings-methods/exercise.js b/exercises/F-strings-methods/exercise.js
index 2cffa6a81..add3b6598 100644
--- a/exercises/F-strings-methods/exercise.js
+++ b/exercises/F-strings-methods/exercise.js
@@ -1,3 +1,9 @@
 // Start by creating a variable `message`
 
+var name= "Ekrem";
+var length = name.length;
+
+var message= "My name is " + name + " and my name is " + length + " characters long";
+
+
 console.log(message);
diff --git a/exercises/F-strings-methods/exercise2.js b/exercises/F-strings-methods/exercise2.js
index b4b46943d..b072678ec 100644
--- a/exercises/F-strings-methods/exercise2.js
+++ b/exercises/F-strings-methods/exercise2.js
@@ -1,3 +1,9 @@
 const name = " Daniel  ";
 
+var nameWithoutTrim = name.trim();
+
+var length = nameWithoutTrim.length;
+
+var message= "My name is " + nameWithoutTrim + " and my name is " + length + " characters long";
+
 console.log(message);
diff --git a/exercises/G-numbers/exercise.js b/exercises/G-numbers/exercise.js
index 49e7bc00b..c5b752c49 100644
--- a/exercises/G-numbers/exercise.js
+++ b/exercises/G-numbers/exercise.js
@@ -1 +1,11 @@
 // Start by creating a variables `numberOfStudents` and `numberOfMentors`
+function sumStudentsAndMentors (a,b){
+    return a+b;
+}
+var numberOfStudents = 15;
+console.log("Number of students: "+numberOfStudents);
+var numberOfMentors = 8;
+console.log("Number of mentors: "+numberOfMentors);
+var total = sumStudentsAndMentors(numberOfStudents, numberOfMentors);
+console.log("Total number of students and mentors: " + total); // with use function
+console.log("Total number of students and mentors: " + (numberOfMentors+numberOfStudents)); //just use basic sum
\ No newline at end of file
diff --git a/exercises/I-floats/exercise.js b/exercises/I-floats/exercise.js
index a5bbcd852..f8eaa0d37 100644
--- a/exercises/I-floats/exercise.js
+++ b/exercises/I-floats/exercise.js
@@ -1,2 +1,12 @@
 var numberOfStudents = 15;
 var numberOfMentors = 8;
+var total = numberOfMentors+numberOfStudents;
+
+var roundPercentageOfStudents = Math.round((numberOfStudents*100)/total);
+console.log("Percentage students: " + roundPercentageOfStudents+"%");
+
+var roundPercentageOfMentors = Math.round((numberOfMentors*100)/total);
+console.log("Percentage mentors: " + roundPercentageOfMentors+"%");
+
+
+
diff --git a/exercises/J-functions/exercise.js b/exercises/J-functions/exercise.js
index 0ae5850e5..1a2e36f37 100644
--- a/exercises/J-functions/exercise.js
+++ b/exercises/J-functions/exercise.js
@@ -1,4 +1,6 @@
 function halve(number) {
+
+  return number / 2;
   // complete the function here
 }
 
diff --git a/exercises/J-functions/exercise2.js b/exercises/J-functions/exercise2.js
index 82ef5e780..468d45596 100644
--- a/exercises/J-functions/exercise2.js
+++ b/exercises/J-functions/exercise2.js
@@ -1,5 +1,6 @@
 function triple(number) {
   // complete function here
+  return number * 3;
 }
 
 var result = triple(12);
diff --git a/exercises/K-functions-parameters/exercise.js b/exercises/K-functions-parameters/exercise.js
index 8d5db5e69..34310722b 100644
--- a/exercises/K-functions-parameters/exercise.js
+++ b/exercises/K-functions-parameters/exercise.js
@@ -1,5 +1,7 @@
 // Complete the function so that it takes input parameters
-function multiply() {
+function multiply(a, b) {
+  return a * b;
+
   // Calculate the result of the function and return it
 }
 
diff --git a/exercises/K-functions-parameters/exercise2.js b/exercises/K-functions-parameters/exercise2.js
index db7a8904b..ab4102430 100644
--- a/exercises/K-functions-parameters/exercise2.js
+++ b/exercises/K-functions-parameters/exercise2.js
@@ -1,4 +1,7 @@
 // Declare your function first
+function divide(a, b) {
+  return a / b;
+}
 
 var result = divide(3, 4);
 
diff --git a/exercises/K-functions-parameters/exercise3.js b/exercises/K-functions-parameters/exercise3.js
index 537e9f4ec..3341b2910 100644
--- a/exercises/K-functions-parameters/exercise3.js
+++ b/exercises/K-functions-parameters/exercise3.js
@@ -1,4 +1,7 @@
 // Write your function here
+function createGreeting(name) {
+  return "Hello, my name is " + name;
+}
 
 var greeting = createGreeting("Daniel");
 
diff --git a/exercises/K-functions-parameters/exercise4.js b/exercises/K-functions-parameters/exercise4.js
index 7ab44589e..6afdab7bc 100644
--- a/exercises/K-functions-parameters/exercise4.js
+++ b/exercises/K-functions-parameters/exercise4.js
@@ -1,5 +1,9 @@
 // Declare your function first
-
+function summation(num1, num2) {
+  return num1 + num2;
+}
 // Call the function and assign to a variable `sum`
 
+var sum = summation(13, 124);
+
 console.log(sum);
diff --git a/exercises/K-functions-parameters/exercise5.js b/exercises/K-functions-parameters/exercise5.js
index 7c5bcd605..8795f0fc4 100644
--- a/exercises/K-functions-parameters/exercise5.js
+++ b/exercises/K-functions-parameters/exercise5.js
@@ -1,4 +1,7 @@
 // Declare your function here
+function createLongGreeting(name, age) {
+  return "Hello, my name is " + name + " and I'm " + age + " years old";
+}
 
 const greeting = createLongGreeting("Daniel", 30);
 
diff --git a/exercises/L-functions-nested/exercise.js b/exercises/L-functions-nested/exercise.js
index a5d377442..0df8997e6 100644
--- a/exercises/L-functions-nested/exercise.js
+++ b/exercises/L-functions-nested/exercise.js
@@ -3,3 +3,15 @@ var mentor2 = "Irina";
 var mentor3 = "Mimi";
 var mentor4 = "Rob";
 var mentor5 = "Yohannes";
+
+function changeToUppercase(name) {
+  return (upperCasename = name.toUpperCase());
+}
+function shoutyGreeting(upperCasename) {
+  return "HELLO " + upperCasename;
+}
+console.log(shoutyGreeting(changeToUppercase(mentor1)));
+console.log(shoutyGreeting(changeToUppercase(mentor2)));
+console.log(shoutyGreeting(changeToUppercase(mentor3)));
+console.log(shoutyGreeting(changeToUppercase(mentor4)));
+console.log(shoutyGreeting(changeToUppercase(mentor5)));
diff --git a/extra/1-currency-conversion.js b/extra/1-currency-conversion.js
index 75b3c6aab..c32d32190 100644
--- a/extra/1-currency-conversion.js
+++ b/extra/1-currency-conversion.js
@@ -5,7 +5,9 @@
   Write a function that converts a price to USD (exchange rate is 1.4 $ to £)
 */
 
-function convertToUSD() {}
+function convertToUSD(Pound) {
+  return Pound * 1.4;
+}
 
 /*
   CURRENCY CONVERSION
@@ -14,8 +16,14 @@ function convertToUSD() {}
   Write a new function for converting to the Brazilian real (exchange rate is 5.7 BRL to £)
   They have also decided that they should add a 1% fee to all foreign transactions, which means you only convert 99% of the £ to BRL.
 */
-
-function convertToBRL() {}
+function fixDecimal(num, decimal) {
+  decimal = Math.pow(10, decimal);
+  return Math.round(num * decimal) / decimal;
+}
+
+function convertToBRL(Pound) {
+  return fixDecimal(Pound * 5.7 * 0.99, 2);
+}
 
 /* ======= TESTS - DO NOT MODIFY ===== 
 There are some Tests in this file that will help you work out if your code is working.
diff --git a/extra/2-piping.js b/extra/2-piping.js
index b4f8c4c1b..da00ca88b 100644
--- a/extra/2-piping.js
+++ b/extra/2-piping.js
@@ -16,26 +16,26 @@
   the final result to the variable goodCode
 */
 
-function add() {
-
+function add(num1, num2) {
+  return num1 + num2;
 }
 
-function multiply() {
-
+function multiply(num1, num2) {
+  return num1 * num2;
 }
 
-function format() {
-
+function format(num1) {
+  return "£" + num1;
 }
 
 const startingValue = 2;
 
 // Why can this code be seen as bad practice? Comment your answer.
-let badCode =
+let badCode = `${format(multiply(2, add(10, startingValue)))}`;
 
 /* BETTER PRACTICE */
 
-let goodCode =
+let goodCode = format(multiply(2, add(10, startingValue)));
 
 /* ======= TESTS - DO NOT MODIFY ===== 
 There are some Tests in this file that will help you work out if your code is working.
diff --git a/extra/3-magic-8-ball.js b/extra/3-magic-8-ball.js
index 46f65f928..2bd142607 100644
--- a/extra/3-magic-8-ball.js
+++ b/extra/3-magic-8-ball.js
@@ -45,10 +45,37 @@
 
 // This should log "The ball has shaken!"
 // and return the answer.
-function shakeBall() {
-  //Write your code in here
+//for (let i = 0; i < 21; ++i) {
+console.log("The ball has shaken!");
+function shakeBall(answers) {
+  const answer = answers.sort(() => Math.random() * 20).slice(0, 1);
+  //return answer;
+  console.log(answer);
 }
 
+let answer = shakeBall([
+  "It is certain.",
+  "It is decidedly so.",
+  "Without a doubt.",
+  "Yes - definitely.",
+  "You may rely on it.",
+  "As I see it, yes.",
+  "Most likely.",
+  "Outlook good.",
+  "Yes.",
+  "Signs point to yes.",
+  "Reply hazy, try again.",
+  "Ask again later.",
+  "Better not tell you now.",
+  "Cannot predict now.",
+  "Concentrate and ask again.",
+  "Don't count on it.",
+  "My reply is no.",
+  "My sources say no.",
+  "Outlook not so good.",
+  "Very doubtful.",
+]);
+
 /* 
   This function should say whether the answer it is given is
     - very positive
@@ -58,10 +85,37 @@ function shakeBall() {
 
   This function should expect to be called with any value which was returned by the shakeBall function.
 */
+
 function checkAnswer(answer) {
-  //Write your code in here
+  if (
+    answer === "[ 'It is certain.' ]" ||
+    answer === "It is decidedly so." ||
+    answer === "You may rely on it." ||
+    answer === "Without a doubt." ||
+    answer === "Yes - definitely."
+  ) {
+    return "very positive";
+  } else if (
+    answer === "Yes." ||
+    answer === "As I see it, yes." ||
+    answer === "Signs point to yes." ||
+    answer === "Most likely." ||
+    answer === "Outlook good."
+  ) {
+    return "positive";
+  } else if (
+    answer === "Reply hazy, try again." ||
+    answer === "Ask again later." ||
+    answer === "Better not tell you now." ||
+    answer === "Cannot predict now." ||
+    answer === "Concentrate and ask again."
+  ) {
+    return "negative";
+  } else {
+    return "very negative";
+  }
 }
-
+//}
 /* 
 ==================================
 ======= TESTS - DO NOT MODIFY =====
@@ -101,7 +155,9 @@ test("magic 8 ball returns different values each time", () => {
     );
   }
 
-  let seenPositivities = new Set(Array.from(seenAnswers.values()).map(checkAnswer));
+  let seenPositivities = new Set(
+    Array.from(seenAnswers.values()).map(checkAnswer)
+  );
   if (seenPositivities.size < 2) {
     throw Error(
       "Expected to random answers with different positivities each time shakeBall was called, but always got the same one"
diff --git a/mandatory/1-syntax-errors.js b/mandatory/1-syntax-errors.js
index a10cc9ac2..730b464ac 100644
--- a/mandatory/1-syntax-errors.js
+++ b/mandatory/1-syntax-errors.js
@@ -1,16 +1,16 @@
 // There are syntax errors in this code - can you fix it to pass the tests?
 
-function addNumbers(a b c) {
+function addNumbers(a, b, c) {
   return a + b + c;
 }
 
-function introduceMe(name, age)
-  return "Hello, my name is " + name "and I am " age + "years old";
-
+function introduceMe(name, age) {
+  return "Hello, my name is " + name + " and I am " + age + " years old";
+}
 function getTotal(a, b) {
-  total = a ++ b;
+  total = a + b;
 
-  return "The total is total";
+  return "The total is " + total;
 }
 
 /* 
diff --git a/mandatory/2-logic-error.js b/mandatory/2-logic-error.js
index 9cca7603b..37c4ebc15 100644
--- a/mandatory/2-logic-error.js
+++ b/mandatory/2-logic-error.js
@@ -1,16 +1,15 @@
 // The syntax for this function is valid but it has an error, find it and fix it.
 
 function trimWord(word) {
-  return wordtrim();
+  return word.trim();
 }
 
 function getStringLength(word) {
-  return "word".length();
+  return word.length;
 }
 
 function multiply(a, b, c) {
-  a * b * c;
-  return;
+  return a * b * c;
 }
 
 /* 
diff --git a/mandatory/3-function-output.js b/mandatory/3-function-output.js
index 5a953ba60..e1ff982ea 100644
--- a/mandatory/3-function-output.js
+++ b/mandatory/3-function-output.js
@@ -5,10 +5,11 @@ function getRandomNumber() {
 
 // Add comments to explain what this function does. You're meant to use Google!
 function combine2Words(word1, word2) {
-  return word1.concat(word2);
+  return word1.concat(" ", word2);
 }
 
 function concatenate(firstWord, secondWord, thirdWord) {
+  return firstWord.concat(" ", secondWord, " ", thirdWord);
   // Write the body of this function to concatenate three words together.
   // Look at the test case below to understand what this function is expected to return.
 }
diff --git a/mandatory/4-tax.js b/mandatory/4-tax.js
index ba77c7ae2..7ada32bd1 100644
--- a/mandatory/4-tax.js
+++ b/mandatory/4-tax.js
@@ -5,7 +5,10 @@
   Sales tax is 20% of the price of the product.
 */
 
-function calculateSalesTax() {}
+function calculateSalesTax(productPrice) {
+  let withTax = productPrice * 0.2 + productPrice;
+  return withTax;
+}
 
 /*
   CURRENCY FORMATTING
@@ -17,8 +20,10 @@ function calculateSalesTax() {}
   Remember that the prices must include the sales tax (hint: you already wrote a function for this!)
 */
 
-function addTaxAndFormatCurrency() {}
-
+function addTaxAndFormatCurrency(productPrice) {
+  let withTaxWithFormat = productPrice * 0.2 + productPrice;
+  return "£" + withTaxWithFormat.toFixed(2);
+}
 /* 
 ===================================================
 ======= TESTS - DO NOT MODIFY BELOW THIS LINE =====