forma-time

Author: FAprogrammerO

Sprint-2/1-key-errors/1.js

@@ -1,20 +1,19 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============> An error will occur because console.log(decimalNumber) tries to access a variable that does not exist in the global scope.
 
 // Try playing computer with the example to work out what is going on
 
-function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
-
-  return percentage;
-}
 
-console.log(decimalNumber);
 
-// =============> write your explanation here
+// =============> decimalNumber is already a parameter, and JavaScript does not allow redeclaring a parameter woth const.
 
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+// =============>
+ function convertToPercentage(decimalNumber) {
+  const percentage = `${decimalNumber * 100}%`;
+  return percentage;
+}
+
+console.log(convertToPercentage(0.5));

Sprint-2/1-key-errors/2.js

@@ -3,18 +3,19 @@
 
 // this function should square any number but instead we're going to get an error
 
-// =============> write your prediction of the error here
+// =============> SyntaxError
 
-function square(3) {
-    return num * num;
-}
 
-// =============> write the error message here
+// =============> Unexpected number
 
-// =============> explain this error message here
+// =============> function parameters must be variable not values.
 
 // Finally, correct the code to fix the problem
 
-// =============> write your new code here
+// =============> 
+function square(num) {
+    return num * num;
+}
+console.log(square(3));
 
 

Sprint-2/2-mandatory-debug/0.js

@@ -1,14 +1,13 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> SyntaxError undefined function
 
-function multiply(a, b) {
-  console.log(a * b);
-}
-
-console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
-// =============> write your explanation here
+// =============> We use console.log() only when we want to print something immediately. In this case we need to use return.
 
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function multiply(a, b) {
+  return a * b;
+}
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);

Sprint-2/2-mandatory-debug/1.js

@@ -1,13 +1,12 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> the sum is undefined
 
-function sum(a, b) {
-  return;
-  a + b;
-}
-
-console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
-// =============> write your explanation here
+// =============> This is due to Automatic semicolon Insertion
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function sum(a, b) {
+  return a + b;
+}
+
+console.log(`The sum of 10 + 32 is ${sum(10, 32)}`);

Sprint-2/2-mandatory-debug/2.js

@@ -1,24 +1,31 @@
 // Predict and explain first...
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============> The output will always be 3 for all cases.
 
+
+// Now run the code and compare the output to your prediction
+// =============> write the output here 
+// The last digit of 42 is 3
+//The last digit of 105 is 3
+//The last digit of 806 is 3
+// Explain why the output is the way it is
+// =============> write your explanation here
+//The function does not have a parameter.
+//It does not use the values 42, 105, or 806.
+//It always uses the global variable:
+// Finally, correct the code to fix the problem
+// =============> write your new code here
 const num = 103;
 
-function getLastDigit() {
-  return num.toString().slice(-1);
+function getLastDigit(value) {
+  return value.toString().slice(-1);
 }
 
 console.log(`The last digit of 42 is ${getLastDigit(42)}`);
 console.log(`The last digit of 105 is ${getLastDigit(105)}`);
 console.log(`The last digit of 806 is ${getLastDigit(806)}`);
 
-// Now run the code and compare the output to your prediction
-// =============> write the output here
-// Explain why the output is the way it is
-// =============> write your explanation here
-// Finally, correct the code to fix the problem
-// =============> write your new code here
 
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem

Sprint-2/3-mandatory-implement/1-bmi.js

@@ -15,5 +15,8 @@
 // It should return their Body Mass Index to 1 decimal place
 
 function calculateBMI(weight, height) {
-    // return the BMI of someone based off their weight and height
-}
+  const squareHeight = height * height;
+  const bmi = weight / squareHeight;
+  return Number(bmi.toFixed(1));
+}
+console.log(calculateBMI(60, 1.70));

Sprint-2/3-mandatory-implement/2-cases.js

@@ -14,3 +14,9 @@
 // You will need to come up with an appropriate name for the function
 // Use the MDN string documentation to help you find a solution
 // This might help https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase
+function toUpperSnakeCase(str) {
+     return str.toUpperCase().replaceAll(" ", "_");
+}
+
+console.log(toUpperSnakeCase("Hello there")); // "HELLO_THERE"
+console.log(toUpperSnakeCase("lord of the rings")); // "LORD_OF_THE_RINGS"

Sprint-2/3-mandatory-implement/3-to-pounds.js

@@ -4,3 +4,45 @@
 // You will need to declare a function called toPounds with an appropriately named parameter.
 
 // You should call this function a number of times to check it works for different inputs
+// ===>Code
+// const penceString = "399p";
+
+// const penceStringWithoutTrailingP = penceString.substring(
+//   0,
+//   penceString.length - 1
+// );
+
+// const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+// const pounds = paddedPenceNumberString.substring(
+//   0,
+//   paddedPenceNumberString.length - 2 
+// );
+
+// const pence = paddedPenceNumberString
+//   .substring(paddedPenceNumberString.length - 2)
+//   .padEnd(2, "0");
+
+// console.log(`£${pounds}.${pence}`);
+
+
+
+
+// ===>Reusable Code 
+
+
+function toPounds(str){
+
+    const onlyNumbers = str.replace(/[^\d]/g, ''); // removes everything that is not a digit
+    const decimals = (onlyNumbers/100).toFixed(2); // converts pence to pounds
+
+    return `£${decimals}`;
+};
+
+
+
+// ===> test 
+
+const examples = ["80p", "Fay", "130p", "£3.50", "10000"];
+for (const example of examples) {
+    console.log(toPounds(example));
+}

Sprint-2/4-mandatory-interpret/time-format.js

@@ -17,18 +17,22 @@ function formatTimeDisplay(seconds) {
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
-// =============> write your answer here
+// =============> pad function will be called 3 times when formatTimeDisplay is called.
 
 // Call formatTimeDisplay with an input of 61, now answer the following:
 
 // b) What is the value assigned to num when pad is called for the first time?
-// =============> write your answer here
+// =============> The value assigned to num when pad is called for the first time is 0.
+
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+/* =============>  The return value of pad when it is called for the first time is "00".
+ because num is 0, and when we convert it to a string and pad it to 2 
+characters with leading zeros, it becomes "00".*/
 
 // d) What is the value assigned to num when pad is called for the last time in this program?  Explain your answer
-// =============> write your answer here
+// =============> The value assigned to num when pad is called for the last time in this program is 1.
+
 
 // e) What is the return value assigned to num when pad is called for the last time in this program?  Explain your answer
-// =============> write your answer here
+// =============>The return value assigned to num when pad is called for the last time in this program is "01".

Sprint-2/5-stretch-extend/format-time.js

@@ -22,4 +22,4 @@ const targetOutput2 = "11:00 pm";
 console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
-);
+);