CodeYourFuture · BenyamWorku · Jan 21, 2021 · Jan 22, 2021 · Jan 22, 2021 · Jan 23, 2021
diff --git a/exercises/A-setup-ide/README.md b/exercises/A-setup-ide/README.md
@@ -2,12 +2,12 @@ There are some tools that will help you to write code. One of these, [Prettier](
 
 ### 1. Install prettier
 
-* In Visual Studio open the extensions panel (see https://code.visualstudio.com/docs/editor/extension-gallery#_browse-and-install-extensions)
-* Search for `Prettier - Code formatter`
-* Click install on the top result
+- In Visual Studio open the extensions panel (see https://code.visualstudio.com/docs/editor/extension-gallery#_browse-and-install-extensions)
+- Search for `Prettier - Code formatter`
+- Click install on the top result
 
 ### 2. Enable formatting on save
 
-* In Visual Studio open the settings file (see https://code.visualstudio.com/docs/getstarted/settings#_creating-user-and-workspace-settings)
-* Search for `editor format`
-* Set `editor.formatOnSave` and `editor.formatOnPaste` to true
+- In Visual Studio open the settings file (see https://code.visualstudio.com/docs/getstarted/settings#_creating-user-and-workspace-settings)
+- Search for `editor format`
+- Set `editor.formatOnSave` and `editor.formatOnPaste` to true
diff --git a/extra/1-currency-conversion.js b/extra/1-currency-conversion.js
@@ -5,7 +5,10 @@
   Write a function that converts a price to USD (exchange rate is 1.4 $ to £)
 */
 
-function convertToUSD() {}
+function convertToUSD(pricesInPounds) {
+  // converts prices in pounds to prices American Dollar
+  return pricesInPounds * 1.4;
+}
 
 /*
   CURRENCY FORMATTING
@@ -15,7 +18,12 @@ 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(pricesInPounds) {
+  // converts prices in pound to prices in Brazilian Real
+  return 5.7 * pricesInPounds * 0.99;
+
+
+}
 
 /* ======= 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
@@ -16,26 +16,29 @@
   the final result to the variable goodCode
 */
 
-function add() {
-
+function add(firstNumber, secondNumber) {
+    return firstNumber + secondNumber;
 }
 
-function multiply() {
-
+function multiply(firstNumber, secondNumber) {
+    return firstNumber * secondNumber;
 }
 
-function format() {
+function format(numberToFormat) {
+    return `£${numberToFormat}`;
 
 }
 
 const startingValue = 2
 
 // Why can this code be seen as bad practice? Comment your answer.
-let badCode = 
+// bad code because it is not readable
+let badCode = format(multiply(2, add(startingValue, 10)));
 
 /* BETTER PRACTICE */
-
-let goodCode = 
+let addTen = add(startingValue,10) ;
+let multiplyByTwo = multiply (2, addTen);
+let goodCode = format(multiplyByTwo);
 
 /* ======= 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
@@ -1,52 +1,39 @@
-/**
-
-  Let's peer into the future using a Magic 8 Ball!
-  https://en.wikipedia.org/wiki/Magic_8-Ball 
-
-  There are a few steps to being able view the future though:
-  * Ask a question
-  * Shake the ball
-  * Get an answer
-  * Decide if it's positive or negative
-
-  The question can be anything, but the answers are fixed,
-  and have different levels of positivity or negativity.
-
-  Below are the possible answers:
-
-  ## Very positive
-    It is certain.
-    It is decidedly so.
-    Without a doubt.
-    Yes - definitely.
-    You may rely on it.
-
-  ## Positive
-    As I see it, yes.
-    Most likely.
-    Outlook good.
-    Yes.
-    Signs point to yes.
-
-  ## Negative
-    Reply hazy, try again.
-    Ask again later.
-    Better not tell you now.
-    Cannot predict now.
-    Concentrate and ask again.
-
-  ## Very negative
-    Don't count on it.
-    My reply is no.
-    My sources say no.
-    Outlook not so good.
-    Very doubtful.
-*/
 
+// creating a magicAnswer object with all the possible answers
+const magicAnswer = {
+  "very positive": ["It is certain.",
+    "It is decidedly so.",
+    "Without a doubt.",
+    "Yes - definitely.",
+    "You may rely on it."]
+  ,
+  "positive": ["As I see it, yes." ,
+    "Most likely.",
+   " Outlook good.",
+    "Yes.",
+    "Signs point to yes."],
+  "negative": ["Reply hazy, try again.",
+    "Ask again later.",
+    "Better not tell you now.",
+    "Cannot predict now.",
+    "Concentrate and ask again."],
+  "very negative": [ "Don't count on it.",
+    "My reply is no.",
+    "My sources say no.",
+    "Outlook not so good.",
+    "Very doubtful."]
+};
 // This should log "The ball has shaken!"
 // and return the answer.
 function shakeBall() {
-  //Write your code in here
+  console.log("The ball has shaken!");
+  // outputs 0,1,2,3 corresponding to very/positive,very/negative
+  let answerCategory = Math.round(Math.random() * 3);
+  // these represent the arrays' five options i.e. 0,1,2,3,4
+  let possibleAnswer = Math.round(Math.random() * 4);
+  // the function returns random answers every time it is invoked
+  return magicAnswer[Object.keys(magicAnswer)[answerCategory]][possibleAnswer];
+
 }
 
 /* 
@@ -59,7 +46,16 @@ 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
+  for (const group of Object.keys(magicAnswer))
+      // iterating through all the keys of the magicAnswer object 
+    {
+    if (magicAnswer[group].includes(answer))
+      // checking which category the answer belongs to
+      {
+      return group;
+      }
+    }
+
 }
 
 /* 

diff --git a/mandatory/1-syntax-errors.js b/mandatory/1-syntax-errors.js
@@ -1,16 +1,18 @@
 // 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
@@ -1,16 +1,16 @@
 // 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
@@ -1,14 +1,17 @@
 // Add comments to explain what this function does. You're meant to use Google!
 function getNumber() {
+  // generates random floating numbers between zero and 10 but never 10
   return Math.random() * 10;
 }
 
 // Add comments to explain what this function does. You're meant to use Google!
 function s(w1, w2) {
+  // stringing together two strings-no spaces- and returns a string
   return w1.concat(w2);
 }
 
 function concatenate(firstWord, secondWord, thirdWord) {
+  return firstWord + " ".concat(secondWord) + " ".concat(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
@@ -5,7 +5,10 @@
   Sales tax is 20% of the price of the product
 */
 
-function calculateSalesTax() {}
+function calculateSalesTax(prices) {
+  // the sales tax is 20% of the prices
+  return 0.2 * prices;
+}
 
 /*
   CURRENCY FORMATTING
@@ -17,7 +20,11 @@ function calculateSalesTax() {}
   Remember that the prices must include the sales tax (hint: you already wrote a function for this!)
 */
 
-function addTaxAndFormatCurrency() {}
+function addTaxAndFormatCurrency(prices) {
+  // this function adds on the 20% tax to the original price
+  let afterTax = prices + calculateSalesTax(prices);
+  return `£${afterTax}`
+}
 
 /* 
 ===================================================