CodeYourFuture · DelniaAlipour · Feb 18, 2023 · Feb 18, 2023
diff --git 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(sales) {
+  return sales*(1.4);
+}
 
 /*
   CURRENCY CONVERSION
@@ -15,7 +17,9 @@ 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(sales) {
+ return Number((sales*0.99*5.7).toFixed(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
@@ -16,26 +16,31 @@
   the final result to the variable goodCode
 */
 
-function add() {
-
+function add(a,b) {
+ return a+b;
 }
 
-function multiply() {
-
+function multiply(a,b) {
+ return a*b;
 }
 
-function format() {
-
+function format(number) {
+ return "£"+ number;
 }
 
 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));
+//This code is not easy to be read, it makes confusion.
+
 
 /* BETTER PRACTICE */
 
-let goodCode =
+//let goodCode =
+let sum= add(startingValue,10);
+let multiplies=multiply(sum,2);
+let goodCode=format(multiplies);
 
 /* ======= 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
@@ -45,8 +45,49 @@
 
 // This should log "The ball has shaken!"
 // and return the answer.
+
+let veryPositive=
+["It is certain.",
+"It is decidedly so.",
+"Without a doubt.",
+"Yes - definitely.",
+"You may rely on it."];
+
+
+let positive=
+["As I see it, yes.",
+"Most likely.",
+"Outlook good.",
+"Yes.",
+"Signs point to yes."];
+
+
+let negative=
+["Reply hazy, try again.",
+"Ask again later.",
+"Better not tell you now.",
+"Cannot predict now.",
+"Concentrate and ask again."];
+
+let veryNegative=
+["Don't count on it.",
+"My reply is no.",
+"My sources say no.",
+"Outlook not so goo.",
+"Very doubtful."];
+
+let answers=[
+  veryPositive,
+  positive,
+  negative,
+  veryNegative];
+
 function shakeBall() {
   //Write your code in here
+  console.log("The ball has shaken!");
+  const answerMood=  Math.floor(Math.random() * answers.length);
+  const randomAnswer=  Math.floor(Math.random() * answers[answerMood].length);
+  return answers[answerMood][randomAnswer];
 }
 
 /* 
@@ -58,8 +99,18 @@ 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 (veryPositive.includes(answer)) {
+    return "very positive";
+  } else if (positive.includes(answer)) {
+    return "positive";
+  } else if (negative.includes(answer)) {
+    return "negative";
+  } else if (veryNegative.includes(answer)) {
+    return "very negative";
+  }
 }
 
 /* 

diff --git a/mandatory/1-syntax-errors.js b/mandatory/1-syntax-errors.js
@@ -1,16 +1,17 @@
 // 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;
+ let 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 +1,17 @@
 // 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;
 }
 
 /* 

diff --git a/mandatory/3-function-output.js b/mandatory/3-function-output.js
@@ -2,15 +2,17 @@
 function getRandomNumber() {
   return Math.random() * 10;
 }
+// this function returns a random number between 0 and 10.
 
 // Add comments to explain what this function does. You're meant to use Google!
 function combine2Words(word1, word2) {
   return word1.concat(word2);
 }
-
+// this function merger to or more string together and create a new string.
 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.
+let newString= firstWord.concat(" ",secondWord," ", thirdWord);
+return newString;
+
 }
 
 /* 

diff --git a/mandatory/4-tax.js b/mandatory/4-tax.js
@@ -5,7 +5,9 @@
   Sales tax is 20% of the price of the product.
 */
 
-function calculateSalesTax() {}
+function calculateSalesTax(sales) {
+  return sales*1.2;
+}
 
 /*
   CURRENCY FORMATTING
@@ -17,7 +19,9 @@ function calculateSalesTax() {}
   Remember that the prices must include the sales tax (hint: you already wrote a function for this!)
 */
 
-function addTaxAndFormatCurrency() {}
+function addTaxAndFormatCurrency(sales) {
+  return `£${calculateSalesTax(sales).toFixed(2)}`;
+}
 
 /* 
 ===================================================