london-10/iryna-lypnyk/completed-mandatory&extra-exercises

.gitignore

@@ -1,2 +1,4 @@
 /node_modules/
 /package-lock.json
+.idea
+.vscode

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 Number((price * 1.4).toFixed(2));
+}
 
 /*
   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(price) {
+  return Number(((price * 5.7)*0.99).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(a, b) {
+  return a + b;
 }
 
-function multiply() {
-
+function multiply(a, b) {
+  return a * b;
 }
 
-function format() {
 
+function format(num) {
+  return `£${num}`
 }
 
 const startingValue = 2;
 
 // Why can this code be seen as bad practice? Comment your answer.
-let badCode =
+let badCode = `£${(startingValue + 10 ) * 2}`
 
 /* BETTER PRACTICE */
 
-let goodCode =
+let goodCode = format(multiply(add(startingValue, 10), 2));
 
 /* ======= 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

@@ -45,9 +45,12 @@
 
 // This should log "The ball has shaken!"
 // and return the answer.
-function shakeBall() {
-  //Write your code in here
-}
+const veryPositive = "very positive";
+const positive = "positive";
+const negative = "negative";
+const veryNegative = "very negative";
+const allResults = [veryPositive, positive, negative, veryNegative]
+
 
 /* 
   This function should say whether the answer it is given is
@@ -58,10 +61,61 @@ 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
+const veryPositiveAnswers = [
+  "It is certain.",
+  "It is decidedly so.",
+  "Without a doubt.",
+  "Yes - definitely.",
+  "You may rely on it.",
+];
+
+const positiveAnswers = [
+  "As I see it, yes.",
+  "Most likely.",
+  "Outlook good.",
+  "Yes.",
+  "Signs point to yes.",
+];
+
+const negativeAnswers = [
+    "Reply hazy, try again.",
+    "Ask again later.",
+    "Better not tell you now.",
+    "Cannot predict now.",
+    "Concentrate and ask again.",
+];
+
+const veryNegativeAnswers = [
+  "Don't count on it.",
+  "My reply is no.",
+  "My sources say no.",
+  "Outlook not so good.",
+  "Very doubtful.",
+];
+
+let allAnswers = [veryPositiveAnswers, positiveAnswers, negativeAnswers, veryNegativeAnswers];
+
+function findRandomIndex(max){
+  return  Math.floor(Math.random() * max);
 }
 
+function shakeBall() {
+  console.log("The ball has shaken!");
+  let num1 = findRandomIndex(4);
+  let num2 = findRandomIndex(5);
+  return allAnswers[num1][num2];
+
+  }
+
+function checkAnswer(answer) {
+  let index; 
+  allAnswers.map((answerItem, i)=>{
+    if(answerItem.includes(answer)){
+      index = i;
+    } 
+  })
+  return allResults[index];
+}
 /* 
 ==================================
 ======= TESTS - DO NOT MODIFY =====

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;
-
-  return "The total is total";
+  let total = a + b;
+  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

@@ -1,16 +1,20 @@
 // Add comments to explain what this function does. You're meant to use Google!
+// Returns a random integer from 0 to 9
 function getRandomNumber() {
   return Math.random() * 10;
 }
 
 // Add comments to explain what this function does. You're meant to use Google!
+ //Concatenate strings,numbers, arrays:
 function combine2Words(word1, word2) {
-  return word1.concat(word2);
+    return word1.concat(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 +5,9 @@
   Sales tax is 20% of the price of the product.
 */
 
-function calculateSalesTax() {}
+function calculateSalesTax(price) {
+  return price + price/5;
+}
 
 /*
   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(number) {
+  let tax = calculateSalesTax(number);
+  return `£${(tax).toFixed(2)}`
+}
 
 /* 
 ===================================================