ZA2-Kwanda Silekwa-JavaScript-Core-1-Coursework-Week1

exercises/B-hello-world/exercise.js

@@ -1 +1,2 @@
 console.log("Hello world");
+console.log("Hello World. I am Kwanda Silekwa");

exercises/C-variables/exercise.js

@@ -1,3 +1,6 @@
 // Start by creating a variable `greeting`
+let greeting = "Hello World";
 
-console.log(greeting);
+for (i = 1; i < 4; i++) {
+  console.log(greeting);
+}

exercises/D-strings/exercise.js

@@ -1,3 +1,4 @@
 // Start by creating a variable `message`
+let message = "This is a string";
 
-console.log(message);
+console.log(message + "\n" + typeof message);

exercises/E-strings-concatenation/exercise.js

@@ -1,3 +1,6 @@
 // Start by creating a variable `message`
+let greetingStart = "Hello, my name is ";
+let name_ = "Daniel";
 
+let message = greetingStart + name_;
 console.log(message);

exercises/F-strings-methods/exercise.js

@@ -1,3 +1,6 @@
 // Start by creating a variable `message`
+let greeting = "Hello, my name is Daniel";
+const name_ = "Daniel";
+let nameLength = name_.length;
 
-console.log(message);
+console.log(greeting + " and my name is " + nameLength + " characters long");

exercises/F-strings-methods/exercise2.js

@@ -1,3 +1,5 @@
-const name = " Daniel  ";
+let greeting = "Hello, my name is Daniel";
+const name_ = "Daniel".trim();
+let nameLength = name_.length;
 
-console.log(message);
+console.log(greeting + " and my name is " + nameLength + " characters long");

exercises/G-numbers/exercise.js

@@ -1 +1,15 @@
 // Start by creating a variables `numberOfStudents` and `numberOfMentors`
+let numberOfStudents = 15;
+let numberOfMentors = 8;
+let total = numberOfStudents + numberOfMentors;
+
+console.log(
+  "Number of students: " +
+    numberOfStudents +
+    "\n" +
+    "Number of mentors: " +
+    numberOfMentors +
+    "\n" +
+    "Total number of students and mentors: " +
+    total
+);

exercises/I-floats/exercise.js

@@ -1,2 +1,16 @@
 var numberOfStudents = 15;
 var numberOfMentors = 8;
+let total = numberOfStudents + numberOfMentors;
+
+let percentageOfStudents = Math.round((numberOfStudents / total) * 100);
+let percentageOfMentors = Math.round((numberOfMentors / total) * 100);
+
+console.log(
+  "Percentage of students: " +
+    percentageOfStudents +
+    "%" +
+    "\n" +
+    "Percentage of mentors: " +
+    percentageOfMentors +
+    "%"
+);

exercises/J-functions/exercise.js

@@ -1,5 +1,5 @@
 function halve(number) {
-  // complete the function here
+  return number / 2;
 }
 
 var result = halve(12);

exercises/J-functions/exercise2.js

@@ -1,5 +1,5 @@
 function triple(number) {
-  // complete function here
+  return number * 3;
 }
 
 var result = triple(12);

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`

exercises/K-functions-parameters/exercise2.js

@@ -1,4 +1,6 @@
-// Declare your function first
+function divide(num1, num2) {
+  return num1 / num2;
+}
 
 var result = divide(3, 4);
 

exercises/K-functions-parameters/exercise3.js

@@ -1,4 +1,6 @@
-// Write your function here
+function createGreeting(str) {
+  return "Hello my name is " + str;
+}
 
 var greeting = createGreeting("Daniel");
 

exercises/K-functions-parameters/exercise4.js

@@ -1,5 +1,7 @@
-// Declare your function first
+function sum(num1, num2) {
+  return num1 + num2;
+}
 
-// Call the function and assign to a variable `sum`
+var sum = sum(13, 124);
 
 console.log(sum);

exercises/K-functions-parameters/exercise5.js

@@ -1,4 +1,6 @@
-// Declare your function here
+function createLongGreeting(str, num) {
+  return "Hello my name is " + str + " and I'm " + num + " years old";
+}
 
 const greeting = createLongGreeting("Daniel", 30);
 

exercises/L-functions-nested/exercise.js

@@ -1,5 +1,29 @@
+function shoutyGreeting(str) {
+  greeting = "Hello " + str;
+  return greeting.toUpperCase();
+}
+
 var mentor1 = "Daniel";
 var mentor2 = "Irina";
 var mentor3 = "Mimi";
 var mentor4 = "Rob";
 var mentor5 = "Yohannes";
+
+for (x = 1; x < 6; x++) {
+  if (x == 1) {
+    var greeting = shoutyGreeting(mentor1);
+    console.log(greeting);
+  } else if (x == 2) {
+    var greeting = shoutyGreeting(mentor2);
+    console.log(greeting);
+  } else if (x == 3) {
+    var greeting = shoutyGreeting(mentor3);
+    console.log(greeting);
+  } else if (x == 4) {
+    var greeting = shoutyGreeting(mentor4);
+    console.log(greeting);
+  } else if (x == 5) {
+    var greeting = shoutyGreeting(mentor5);
+    console.log(greeting);
+  }
+}

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 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(price) {
+  amount = (price - (price * 1) / 100) * 5.7;
+  newAmount = amount.toFixed(2);
+  return parseFloat(newAmount);
+}
 
 /* ======= 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

@@ -16,27 +16,28 @@
   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.toString();
 }
 
 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 =
-
+let goodCode = add(startingValue, 10);
+goodCode = multiply(goodCode, 2);
+goodCode = format(goodCode);
 /* ======= 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

@@ -42,11 +42,43 @@
     Outlook not so good.
     Very doubtful.
 */
+const matchers = require("jest-extended");
+expect.extend(matchers);
+
+const possibleAnswers = [
+  // 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
+  let randomAnswer = Math.round(Math.random() * 20);
+  console.log("The ball has shaken!");
+  return possibleAnswers[randomAnswer];
 }
 
 /* 
@@ -60,6 +92,17 @@ function shakeBall() {
 */
 function checkAnswer(answer) {
   //Write your code in here
+  let indexOfAnswers = possibleAnswers.indexOf(answer);
+
+  if (indexOfAnswers <= 4) {
+    return "very positive";
+  } else if (indexOfAnswers >= 5 && indexOfAnswers < 10) {
+    return "positive";
+  } else if (indexOfAnswers >= 10 && indexOfAnswers < 15) {
+    return "negative";
+  } else if (indexOfAnswers >= 15 && indexOfAnswers < 20) {
+    return "very negative";
+  }
 }
 
 /* 
@@ -101,7 +144,9 @@ 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 " + 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;
 }
 
 /* 

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 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

@@ -1,16 +1,17 @@
 // Add comments to explain what this function does. You're meant to use Google!
 function getRandomNumber() {
-  return Math.random() * 10;
+  return Math.random() * 10; // returns a random number multiplied by 10
 }
 
 // Add comments to explain what this function does. You're meant to use Google!
 function combine2Words(word1, word2) {
-  return word1.concat(word2);
+  return word1.concat(word2); // joins word1 with word2.
 }
 
 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 + " " + thirdWord);
 }
 
 /* 

mandatory/4-tax.js

@@ -5,7 +5,10 @@
   Sales tax is 20% of the price of the product.
 */
 
-function calculateSalesTax() {}
+function calculateSalesTax(price) {
+  priceWithTax = (price * 20) / 100 + price;
+  return priceWithTax;
+}
 
 /*
   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(price) {
+  amount = calculateSalesTax(price);
+  newAmount = amount.toFixed(2);
+  return "£" + newAmount;
+}
 
 /* 
 ===================================================