London10-SAQIB_JAVED-JavaScript-Core-1-Coursework-week1

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(currency) {
+  return currency * 1.4;
+}
 
 /*
   CURRENCY CONVERSION
@@ -15,7 +17,11 @@ 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(currency) {
+  let priceAfterFee = currency * 0.99;
+  let priceInBRL = priceAfterFee * 5.7;
+  return Math.round(priceInBRL * 100) / 100;
+}
 
 /* ======= 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 +16,34 @@
   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(value) {
+  return "£" + value;
 }
 
 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));
+
+/*  in this code there is space and no semicolons ; */
 
 /* BETTER PRACTICE */
 
-let goodCode =
+let goodCode = format(multiply(add(startingValue, 10), 2));
+
+let goodcode = add(10, startingValue);
+console.log("Better practice..", goodCode);
+
+let multiplyByTwo = multiply(goodCode, 2);
+console.log("Better practice..", multiplyByTwo);
 
 /* ======= 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

@@ -45,8 +45,53 @@
 
 // This should log "The ball has shaken!"
 // and return the answer.
+
+let veryPositiveAnswers = [
+  "It is certain.",
+  "It is decidedly so.",
+  "Without a doubt.",
+  "Yes - definitely.",
+  "You may rely on it.",
+];
+
+let positiveAnswers = [
+  "As I see it, yes.",
+  "Most likely.",
+  "Outlook good.",
+  "Yes.",
+  "Signs point to yes.",
+];
+
+let negativeAnswers = [
+  "Reply hazy.",
+  "try again.",
+  "Ask again later.",
+  "Better not tell you now.",
+  "Cannot predict now.",
+  "Concentrate and ask again.",
+];
+
+let veryNegativeAnswers = [
+  "Don't count on it.",
+  "My reply is no.",
+  "My sources say no.",
+  "Outlook not so good.",
+  "Very doubtful.",
+];
+
+let answers = [
+  ...veryPositiveAnswers,
+  ...positiveAnswers,
+  ...negativeAnswers,
+  ...veryNegativeAnswers,
+];
+
+//Write your code in here
+
 function shakeBall() {
-  //Write your code in here
+  console.log("The ball has shaken!");
+  let randomIndex = Math.floor(Math.random() * answers.length);
+  return answers[randomIndex];
 }
 
 /* 
@@ -60,6 +105,16 @@ function shakeBall() {
 */
 function checkAnswer(answer) {
   //Write your code in here
+
+  if (veryPositiveAnswers.includes(answer)) {
+    return "very positive";
+  } else if (positiveAnswers.includes(answer)) {
+    return "positive";
+  } else if (negativeAnswers.includes(answer)) {
+    return "negative";
+  } else if (veryNegativeAnswers.includes(answer)) {
+    return "very negative";
+  }
 }
 
 /* 
@@ -101,7 +156,9 @@ 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 +1,17 @@
 // 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;
+  const 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

@@ -1,14 +1,22 @@
 // Add comments to explain what this function does. You're meant to use Google!
+
+/* Math.random() returns a random number between 0 (inclusive),  and 1 (exclusive). this  code generate random number between 0 and 1 then multiply by 10. */
+
 function getRandomNumber() {
   return Math.random() * 10;
 }
 
 // Add comments to explain what this function does. You're meant to use Google!
+
+/* The concat() method is used to merge two or more arrays. This method does not change the existing arrays, but instead returns a new array. */
+
 function combine2Words(word1, 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.
 }

mandatory/4-tax.js

@@ -5,7 +5,9 @@
   Sales tax is 20% of the price of the product.
 */
 
-function calculateSalesTax() {}
+function calculateSalesTax(price) {
+  return price + (price / 100) * 20;
+}
 
 /*
   CURRENCY FORMATTING
@@ -17,7 +19,10 @@ 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 Price = calculateSalesTax(price);
+  return "£" + Price.toFixed(2);
+}
 
 /* 
 ===================================================