LONDON_10 | SAIM KORKMAZ | JS-1-1

extra/1-currency-conversion.js

@@ -5,7 +5,11 @@
   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 CONVERSION
@@ -15,7 +19,10 @@ 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) {
+  price = price * 5.7 * 0.99;
+  return parseFloat(price.toFixed(2));
+}
 
 /* ======= TESTS - DO NOT MODIFY ===== 
 There are some Tests in this file that will help you work out if your code is working.

extra/2-piping.js

@@ -16,26 +16,27 @@
   the final result to the variable goodCode
 */
 
-function add() {
-
+function add(x, y) {
+  return x + y;
 }
 
-function multiply() {
-
+function multiply(x, y) {
+  return x * y;
 }
 
-function format() {
-
+function format(x) {
+  return `£${x}`;
 }
 
 const startingValue = 2;
 
 // Why can this code be seen as bad practice? Comment your answer.
-let badCode =
+let badCode = format(multiply(add(startingValue, 10), 2));
 
 /* BETTER PRACTICE */
-
-let goodCode =
+const step1 = add(startingValue, 10);
+const step2 = multiply(step1, 2);
+const goodCode = format(step2);
 
 /* ======= TESTS - DO NOT MODIFY ===== 
 There are some Tests in this file that will help you work out if your code is working.

extra/3-magic-8-ball.js

@@ -47,8 +47,33 @@
 // and return the answer.
 function shakeBall() {
   //Write your code in here
-}
 
+  const possibleAnswers = [
+    "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.",
+  ];
+  const randomIndex = Math.floor(Math.random() * possibleAnswers.length);
+  console.log("The ball has shaken!");
+  return possibleAnswers[randomIndex];
+}
 /* 
   This function should say whether the answer it is given is
     - very positive
@@ -60,6 +85,34 @@ function shakeBall() {
 */
 function checkAnswer(answer) {
   //Write your code in here
+
+  if (
+    answer == "It is certain." ||
+    answer == "It is decidedly so." ||
+    answer == "Without a doubt." ||
+    answer == "Yes - definitely." ||
+    answer == "You may rely on it."
+  ) {
+    return "very positive";
+  } else if (
+    answer == "As I see it, yes." ||
+    answer == "Most likely." ||
+    answer == "Outlook good." ||
+    answer == "Yes." ||
+    answer == "Signs point to yes."
+  ) {
+    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";
+  }
 }
 
 /* 
@@ -101,7 +154,9 @@ 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"

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 "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;
 }
 
 /* 

mandatory/2-logic-error.js

@@ -1,16 +1,15 @@
 // The syntax for these functions is valid but there are some errors, find them and fix them
 
 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;
 }
 
 /* 

mandatory/3-function-output.js

@@ -2,15 +2,18 @@
 function getRandomNumber() {
   return Math.random() * 10;
 }
+/* This function generates a random number between 0 and 10, including 0 but not including 10. However, the returned number includes decimal points and is not necessarily an integer.  */
 
 // Add comments to explain what this function does. You're meant to use Google!
 function combine2Words(word1, word2) {
   return word1.concat(word2);
 }
+/* This function takes two strings, word1 and word2, as arguments and concatenates them together using the concat() method. The concat() method returns a new string that is the result of joining two or more strings. */
 
 function concatenate(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.
+  return firstWord.concat(" ", secondWord.concat(" ", thirdWord));
 }
 
 /* 

mandatory/4-tax.js

@@ -5,7 +5,10 @@
   Sales tax is 20% of the price of the product.
 */
 
-function calculateSalesTax() {}
+function calculateSalesTax(price) {
+  price = price + price / 5;
+  return price;
+}
 
 /*
   CURRENCY FORMATTING
@@ -17,7 +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(price) {
+  price = price + price / 5;
+  return `£${price.toFixed(2)}`;
+}
 
 /* 
 ===================================================