From 06b1bff7b6ad61a68560193572552843a6844354 Mon Sep 17 00:00:00 2001
From: Murat Demirtas <73036794+muratdemirtas2001@users.noreply.github.com>
Date: Tue, 19 Jan 2021 22:09:46 +0000
Subject: [PATCH 1/4] finishing mandatory part

---
 exercises/B-hello-world/exercise.js           |  5 ++-
 exercises/C-variables/exercise.js             |  3 ++
 exercises/D-strings/exercise.js               |  4 ++
 exercises/E-strings-concatenation/exercise.js |  8 +++-
 exercises/F-strings-methods/exercise.js       | 11 +++++
 exercises/F-strings-methods/exercise2.js      |  7 +++-
 exercises/G-numbers/exercise.js               | 12 ++++++
 exercises/I-floats/exercise.js                |  7 ++++
 exercises/J-functions/exercise.js             |  4 +-
 exercises/J-functions/exercise2.js            |  2 +-
 exercises/K-functions-parameters/exercise.js  |  4 +-
 exercises/K-functions-parameters/exercise2.js |  3 ++
 exercises/K-functions-parameters/exercise3.js |  5 ++-
 exercises/K-functions-parameters/exercise4.js |  4 ++
 exercises/K-functions-parameters/exercise5.js |  5 ++-
 mandatory/1-syntax-errors.js                  | 40 +++++++++++--------
 mandatory/2-logic-error.js                    |  7 ++--
 mandatory/3-function-output.js                |  3 ++
 mandatory/4-tax.js                            | 11 ++++-
 19 files changed, 112 insertions(+), 33 deletions(-)

diff --git a/exercises/B-hello-world/exercise.js b/exercises/B-hello-world/exercise.js
index b179ee953..f075cc598 100644
--- a/exercises/B-hello-world/exercise.js
+++ b/exercises/B-hello-world/exercise.js
@@ -1 +1,4 @@
-console.log("Hello world");
+console.log(" Hello World. I just started learning JavaScript");
+console.log(" Hello World. I just started learning JavaScript");
+console.log(" Hello World. I just started learning JavaScript");
+console.log(5);
diff --git a/exercises/C-variables/exercise.js b/exercises/C-variables/exercise.js
index a6bbb9786..628a44964 100644
--- a/exercises/C-variables/exercise.js
+++ b/exercises/C-variables/exercise.js
@@ -1,3 +1,6 @@
 // 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..0a2ace7db 100644
--- a/exercises/D-strings/exercise.js
+++ b/exercises/D-strings/exercise.js
@@ -1,3 +1,7 @@
 // Start by creating a variable `message`
 
+var message = "This is a string";
+var messageType = typeof message;
+
+console.log(messageType);
 console.log(message);
diff --git a/exercises/E-strings-concatenation/exercise.js b/exercises/E-strings-concatenation/exercise.js
index 2cffa6a81..65ce3839e 100644
--- a/exercises/E-strings-concatenation/exercise.js
+++ b/exercises/E-strings-concatenation/exercise.js
@@ -1,3 +1,9 @@
 // Start by creating a variable `message`
 
-console.log(message);
+let message="Hi everyone,nice to meet you, I am "
+
+let name="Murat"
+
+let myMessage= message+name;
+
+console.log(myMessage);
diff --git a/exercises/F-strings-methods/exercise.js b/exercises/F-strings-methods/exercise.js
index 2cffa6a81..e992c0224 100644
--- a/exercises/F-strings-methods/exercise.js
+++ b/exercises/F-strings-methods/exercise.js
@@ -1,3 +1,14 @@
 // Start by creating a variable `message`
+let message1 = "My name is ";
 
+let message2 = " and my name is ";
+
+let message3 = " characters long";
+
+let name = "Murat";
+
+let message = message1 + name + message2 + name.length + message3;
+
+// below method seems easier
+// let message = `My name is ${name} and my name is ${name.length} characters long`; 
 console.log(message);
diff --git a/exercises/F-strings-methods/exercise2.js b/exercises/F-strings-methods/exercise2.js
index b4b46943d..b2e8ffa43 100644
--- a/exercises/F-strings-methods/exercise2.js
+++ b/exercises/F-strings-methods/exercise2.js
@@ -1,3 +1,8 @@
-const name = " Daniel  ";
+const name = " Murat      ";
+
+//assigning trimmed name to a new variable
+let trimmedName = name.trim();
+
+let message = `My name is ${trimmedName} and my name is ${trimmedName.length} characters long`;
 
 console.log(message);
diff --git a/exercises/G-numbers/exercise.js b/exercises/G-numbers/exercise.js
index 49e7bc00b..6077069da 100644
--- a/exercises/G-numbers/exercise.js
+++ b/exercises/G-numbers/exercise.js
@@ -1 +1,13 @@
 // Start by creating a variables `numberOfStudents` and `numberOfMentors`
+
+let numberOfStudents = 15;
+
+let numberOfMentors = 8;
+
+let totalNumbers = numberOfStudents + numberOfMentors;
+
+console.log("Number of students: " + numberOfStudents);
+
+console.log("Number of mentors: " + numberOfMentors);
+
+console.log("Total number of students and mentors: " + totalNumbers);
diff --git a/exercises/I-floats/exercise.js b/exercises/I-floats/exercise.js
index a5bbcd852..9502e7bdd 100644
--- a/exercises/I-floats/exercise.js
+++ b/exercises/I-floats/exercise.js
@@ -1,2 +1,9 @@
 var numberOfStudents = 15;
 var numberOfMentors = 8;
+
+let perOfStudents = numberOfStudents / (numberOfStudents + numberOfMentors);
+let perOfMentors = numberOfMentors / (numberOfMentors + numberOfStudents);
+
+console.log(`Percentage students : ${Math.round(perOfStudents * 100)} %`);
+
+console.log(`Percentage mentors : ${Math.round(perOfMentors * 100)} %`);
diff --git a/exercises/J-functions/exercise.js b/exercises/J-functions/exercise.js
index 0ae5850e5..472cf2749 100644
--- a/exercises/J-functions/exercise.js
+++ b/exercises/J-functions/exercise.js
@@ -1,7 +1,7 @@
 function halve(number) {
-  // complete the function here
+  return number / 2;
 }
 
-var result = halve(12);
+var result = halve(20);
 
 console.log(result);
diff --git a/exercises/J-functions/exercise2.js b/exercises/J-functions/exercise2.js
index 82ef5e780..95ef62512 100644
--- a/exercises/J-functions/exercise2.js
+++ b/exercises/J-functions/exercise2.js
@@ -1,5 +1,5 @@
 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..4614501b1 100644
--- a/exercises/K-functions-parameters/exercise.js
+++ b/exercises/K-functions-parameters/exercise.js
@@ -1,6 +1,6 @@
 // Complete the function so that it takes input parameters
-function multiply() {
-  // Calculate the result of the function and return it
+function multiply(num1, num2) {
+  return num1 * num2;
 }
 
 // Assign the result of calling the function the variable `result`
diff --git a/exercises/K-functions-parameters/exercise2.js b/exercises/K-functions-parameters/exercise2.js
index db7a8904b..0d0c4b3c0 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(num1, num2) {
+  return num1 / num2;
+}
 
 var result = divide(3, 4);
 
diff --git a/exercises/K-functions-parameters/exercise3.js b/exercises/K-functions-parameters/exercise3.js
index 537e9f4ec..d45ed455f 100644
--- a/exercises/K-functions-parameters/exercise3.js
+++ b/exercises/K-functions-parameters/exercise3.js
@@ -1,5 +1,8 @@
 // Write your function here
+function createGreeting(name) {
+  return `Hello, my name is ${name}`;
+}
 
-var greeting = createGreeting("Daniel");
+var greeting = createGreeting("Murat");
 
 console.log(greeting);
diff --git a/exercises/K-functions-parameters/exercise4.js b/exercises/K-functions-parameters/exercise4.js
index 7ab44589e..046c3bebb 100644
--- a/exercises/K-functions-parameters/exercise4.js
+++ b/exercises/K-functions-parameters/exercise4.js
@@ -1,5 +1,9 @@
 // Declare your function first
+function adder(num1, num2) {
+  return num1 + num2;
+}
 
 // Call the function and assign to a variable `sum`
+let sum = adder(13, 124);
 
 console.log(sum);
diff --git a/exercises/K-functions-parameters/exercise5.js b/exercises/K-functions-parameters/exercise5.js
index 7c5bcd605..54c7ede59 100644
--- a/exercises/K-functions-parameters/exercise5.js
+++ b/exercises/K-functions-parameters/exercise5.js
@@ -1,5 +1,8 @@
 // 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);
+const greeting = createLongGreeting("Murat", 30);
 
 console.log(greeting);
diff --git a/mandatory/1-syntax-errors.js b/mandatory/1-syntax-errors.js
index 0a21afd1b..4e8909973 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) {
-    return 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;
 }
 
 /* 
@@ -24,19 +24,25 @@ To run these tests type `node 1-syntax-errors.js` into your terminal
 ===================================================
 */
 
-const util = require('util');
+const util = require("util");
 
 function test(test_name, actual, expected) {
-    let status;
-    if (actual === expected) {
-        status = "PASSED";
-    } else {
-        status = `FAILED: expected: ${util.inspect(expected)} but your function returned: ${util.inspect(actual)}`;
-    }
-
-    console.log(`${test_name}: ${status}`);
+  let status;
+  if (actual === expected) {
+    status = "PASSED";
+  } else {
+    status = `FAILED: expected: ${util.inspect(
+      expected
+    )} but your function returned: ${util.inspect(actual)}`;
+  }
+
+  console.log(`${test_name}: ${status}`);
 }
 
 test("fixed addNumbers function - case 1", addNumbers(3, 4, 6), 13);
-test("fixed introduceMe function", introduceMe("Sonjide", 27), "Hello, my name is Sonjide and I am 27 years old");
+test(
+  "fixed introduceMe function",
+  introduceMe("Sonjide", 27),
+  "Hello, my name is Sonjide and I am 27 years old"
+);
 test("fixed getTotal function", getTotal(23, 5), "The total is 28");
diff --git a/mandatory/2-logic-error.js b/mandatory/2-logic-error.js
index 3c578ad87..1f1245b39 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 getWordLength(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 c9221a200..0d543c3d7 100644
--- a/mandatory/3-function-output.js
+++ b/mandatory/3-function-output.js
@@ -1,14 +1,17 @@
 // Add comments to explain what this function does. You're meant to use Google!
+// This function uses Math.random() to pick up a random number between 0 (inclusive),  and 1 (exclusive) then multiply this with 10 and returns a number between 0-9
 function getNumber() {
   return Math.random() * 10;
 }
 
 // Add comments to explain what this function does. You're meant to use Google!
+// This function takes 2 array as parameter and use concat method  to merge these two arrays. This method does not change the existing arrays, so function returns a new array.
 function s(w1, w2) {
   return w1.concat(w2);
 }
 
 function concatenate(firstWord, secondWord, thirdWord) {
+  return firstWord + " " + 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 c9e41c691..d6ab669ac 100644
--- a/mandatory/4-tax.js
+++ b/mandatory/4-tax.js
@@ -5,7 +5,11 @@
   Sales tax is 20% of the price of the product
 */
 
-function calculateSalesTax() {}
+function calculateSalesTax(price) {
+  let tax = price / 5;
+  let calculatedPrice = tax + price;
+  return calculatedPrice;
+}
 
 /*
   CURRENCY FORMATTING
@@ -17,7 +21,10 @@ function calculateSalesTax() {}
   Remember that the prices must include the sales tax (hint: you already wrote a function for this!)
 */
 
-function addTaxAndFormatCurrency() {}
+function addTaxAndFormatCurrency(price) {
+  let calculatedPrice = calculateSalesTax(price);
+  return `£${calculatedPrice.toFixed(2)}`;
+}
 
 /* 
 ===================================================

From a62e3d4b28dd338a305ce659a600ade503464830 Mon Sep 17 00:00:00 2001
From: Murat Demirtas <73036794+muratdemirtas2001@users.noreply.github.com>
Date: Wed, 20 Jan 2021 00:05:48 +0000
Subject: [PATCH 2/4] finalizing extras section

---
 extra/1-currency-conversion.js |  9 ++++--
 extra/2-piping.js              | 55 ++++++++++++++++++----------------
 extra/3-magic-8-ball.js        | 50 +++++++++++++++++++++++++++++--
 3 files changed, 84 insertions(+), 30 deletions(-)

diff --git a/extra/1-currency-conversion.js b/extra/1-currency-conversion.js
index 70a2fe863..8c6467d3e 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(price) {
+  return price * 1.4;
+}
 
 /*
   CURRENCY FORMATTING
@@ -15,7 +17,10 @@ function convertToUSD() {}
   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 convertToBRL(price) {
+  let newPrice = (price * 99) / 100;
+  return newPrice * 5.7;
+}
 
 /* ======= 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 067dd0f5b..c5ae0a995 100644
--- a/extra/2-piping.js
+++ b/extra/2-piping.js
@@ -16,26 +16,29 @@
   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(num) {
+  return `£${num}`;
 }
 
-const startingValue = 2
+const startingValue = 2;
 
 // Why can this code be seen as bad practice? Comment your answer.
-let badCode = 
+// it is really hard to track functions
+let badCode = format(multiply(add(startingValue, 10), 2));
 
 /* BETTER PRACTICE */
-
-let goodCode = 
+let addedNumbers = add(startingValue, 10);
+let multipliedNumber = multiply(addedNumbers, 2);
+let formattedNumber = format(multipliedNumber);
+let goodCode = formattedNumber;
 
 /* ======= TESTS - DO NOT MODIFY ===== 
 There are some Tests in this file that will help you work out if your code is working.
@@ -43,22 +46,24 @@ There are some Tests in this file that will help you work out if your code is wo
 To run these tests type `node 2-piping.js` into your terminal
 */
 
-const util = require('util');
+const util = require("util");
 
 function test(test_name, actual, expected) {
-    let status;
-    if (actual === expected) {
-        status = "PASSED";
-    } else {
-        status = `FAILED: expected: ${util.inspect(expected)} but your code returned: ${util.inspect(actual)}`;
-    }
-
-    console.log(`${test_name}: ${status}`);
+  let status;
+  if (actual === expected) {
+    status = "PASSED";
+  } else {
+    status = `FAILED: expected: ${util.inspect(
+      expected
+    )} but your code returned: ${util.inspect(actual)}`;
+  }
+
+  console.log(`${test_name}: ${status}`);
 }
 
-test('add function - case 1 works', add(1,3), 4)
-test('add function - case 2 works', add(2.4,5), 7.4)
-test('multiply function works', multiply(2,3), 6)
-test('format function works', format(16), "£16")
-test('badCode variable correctly assigned', badCode, "£24")
-test('goodCode variable correctly assigned', goodCode, "£24")
+test("add function - case 1 works", add(1, 3), 4);
+test("add function - case 2 works", add(2.4, 5), 7.4);
+test("multiply function works", multiply(2, 3), 6);
+test("format function works", format(16), "£16");
+test("badCode variable correctly assigned", badCode, "£24");
+test("goodCode variable correctly assigned", goodCode, "£24");
diff --git a/extra/3-magic-8-ball.js b/extra/3-magic-8-ball.js
index e32182cfe..e34132b61 100644
--- a/extra/3-magic-8-ball.js
+++ b/extra/3-magic-8-ball.js
@@ -45,8 +45,43 @@
 
 // This should log "The ball has shaken!"
 // and return the answer.
+let answers = [
+  [
+    "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",
+  ],
+];
 function shakeBall() {
-  //Write your code in here
+  console.log("The ball has shaken!");
+  let randomNumber1 = Math.floor(Math.random() * 4);
+  let randomNumber2 = Math.floor(Math.random() * 5);
+  let message = answers[randomNumber1][randomNumber2];
+  // console.log(message);
+  return message;
 }
 
 /* 
@@ -59,9 +94,18 @@ 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 (answers[0].includes(answer)) {
+    return "very positive";
+  } else if (answers[1].includes(answer)) {
+    return "positive";
+  } else if (answers[2].includes(answer)) {
+    return "negative";
+  } else if (answers[3].includes(answer)) {
+    return "very negative";
+  }
 }
-
+// let message = checkAnswer(shakeBall());
+// console.log(message);
 /* 
 ==================================
 ======= TESTS - DO NOT MODIFY =====

From 7ce5e921bff6cc6cbe402ead18440afffd013805 Mon Sep 17 00:00:00 2001
From: Murat Demirtas <73036794+muratdemirtas2001@users.noreply.github.com>
Date: Sat, 23 Jan 2021 19:07:39 +0000
Subject: [PATCH 3/4] adding exercise L

---
 exercises/L-functions-nested/exercise.js | 26 ++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/exercises/L-functions-nested/exercise.js b/exercises/L-functions-nested/exercise.js
index a5d377442..ac8ebbd67 100644
--- a/exercises/L-functions-nested/exercise.js
+++ b/exercises/L-functions-nested/exercise.js
@@ -3,3 +3,29 @@ var mentor2 = "Irina";
 var mentor3 = "Mimi";
 var mentor4 = "Rob";
 var mentor5 = "Yohannes";
+
+// In `exercise2.js` you have been provided with the names of some mentors. Write a program that logs a shouty greeting to each one.
+// - Your program should include a function that spells their name in uppercase, and a function that creates a shouty greeting.
+// - Log each greeting to the console.
+
+// ## Expected result
+
+// ```
+// HELLO DANIEL
+// HELLO IRINA
+// HELLO MIMI
+// HELLO ROB
+// HELLO YOHANNES
+
+function changeNameToUpperCase(name) {
+  return name.toUpperCase();
+}
+
+function greeting(name) {
+  console.log(`HELLO ${changeNameToUpperCase(name)}`);
+}
+greeting(mentor1);
+greeting(mentor2);
+greeting(mentor3);
+greeting(mentor4);
+greeting(mentor5);

From af88eaf29450df581a6d55bb9b73976fd9e0b45e Mon Sep 17 00:00:00 2001
From: Murat Demirtas <73036794+muratdemirtas2001@users.noreply.github.com>
Date: Sat, 23 Jan 2021 19:11:45 +0000
Subject: [PATCH 4/4] adding some missing semicolon

---
 exercises/E-strings-concatenation/exercise.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/exercises/E-strings-concatenation/exercise.js b/exercises/E-strings-concatenation/exercise.js
index 65ce3839e..a4651e02b 100644
--- a/exercises/E-strings-concatenation/exercise.js
+++ b/exercises/E-strings-concatenation/exercise.js
@@ -1,9 +1,9 @@
 // Start by creating a variable `message`
 
-let message="Hi everyone,nice to meet you, I am "
+let message = "Hi everyone,nice to meet you, I am ";
 
-let name="Murat"
+let name = "Murat";
 
-let myMessage= message+name;
+let myMessage = message + name;
 
 console.log(myMessage);