Glasgow | 25-ITP-Sep | Christelle Boten | Sprint 2 | Coursework Sprint 2

Sprint-1/1-key-exercises/1-count.js

@@ -1,6 +1,8 @@
 let count = 0;
 
 count = count + 1;
+//console.log(count);
 
 // Line 1 is a variable declaration, creating the count variable with an initial value of 0
 // Describe what line 3 is doing, in particular focus on what = is doing
+// Line 3 is a statement that is reassigning the value of count, to add 1 to the initial declaration which was 0.

Sprint-1/1-key-exercises/2-initials.js

@@ -5,7 +5,9 @@ let lastName = "Johnson";
 // Declare a variable called initials that stores the first character of each string.
 // This should produce the string "CKJ", but you must not write the characters C, K, or J in the code of your solution.
 
-let initials = ``;
+let initial = firstName.charAt(0) + middleName.charAt(0) + lastName.charAt(0);
+//let initials = firstName[0] + middleName[0] + lastName[0];
+//console.log(initial);
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
 

Sprint-1/1-key-exercises/3-paths.js

@@ -16,8 +16,12 @@ console.log(`The base part of ${filePath} is ${base}`);
 
 // Create a variable to store the dir part of the filePath variable
 // Create a variable to store the ext part of the variable
+//console.log(lastSlashIndex);
+console.log(base);
+
+const dir = filePath.slice(0, lastSlashIndex);
+const ext = base.slice(base.lastIndexOf("."));
+console.log(`The extension part of directory ${dir} is ${ext}`);
 
-const dir = ;
-const ext = ;
 
 // https://www.google.com/search?q=slice+mdn

Sprint-1/1-key-exercises/4-random.js

@@ -7,3 +7,9 @@ const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 // Try breaking down the expression and using documentation to explain what it means
 // It will help to think about the order in which expressions are evaluated
 // Try logging the value of num and running the program several times to build an idea of what the program is doing
+
+// Here, Math.rondom creates a random number which is greater than or equals to 0 and less than 1.
+// Math.floor rounds down to the nearest integer which is less than or equals to a given number
+// When creating a random number between 0 and 1, we will multiply it by the (100 - 1 + 1), then round it down to the nearest integer
+// Then add all of that to 1 which is the minimun.
+

Sprint-1/2-mandatory-errors/0.js

@@ -1,2 +1,3 @@
-This is just an instruction for the first activity - but it is just for human consumption
-We don't want the computer to run these 2 lines - how can we solve this problem?
+//This is just an instruction for the first activity - but it is just for human consumption
+//We don't want the computer to run these 2 lines - how can we solve this problem?
+// I added a two forward slashes at the start of each line to make them as comment.

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

@@ -1,4 +1,6 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+let age = 33;
 age = age + 1;
+
+console.log(age);

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

@@ -1,5 +1,9 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
 // what's the error ?
 
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+
+
+// the variable 'cityOfBirth' had to be declared first before doing the console log.
+// This is because the JAvascript reads from top to bottom

Sprint-1/2-mandatory-errors/3.js

@@ -1,9 +1,15 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = String(cardNumber).slice(-4);
+
+console.log (last4Digits)
 
 // The last4Digits variable should store the last 4 digits of cardNumber
 // However, the code isn't working
 // Before running the code, make and explain a prediction about why the code won't work
 // Then run the code and see what error it gives.
 // Consider: Why does it give this error? Is this what I predicted? If not, what's different?
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+
+//Prediction: The slice method doesn't work on numbers and integers. It only works on strings and arrays
+//Error message: The error message states that "Slice is not a function"
+

Sprint-1/2-mandatory-errors/4.js

@@ -1,2 +1,4 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const hourClockTime24 = "20:53";
+const hourClockTime12 = "08:53";
+
+console.log(`The time in a 24 hours format is ${hourClockTime24} and in a 12 hours format is ${hourClockTime12}`);

Sprint-1/3-mandatory-interpret/1-percentage-change.js

@@ -2,7 +2,7 @@ let carPrice = "10,000";
 let priceAfterOneYear = "8,543";
 
 carPrice = Number(carPrice.replaceAll(",", ""));
-priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ,""));
 
 const priceDifference = carPrice - priceAfterOneYear;
 const percentageChange = (priceDifference / carPrice) * 100;
@@ -12,11 +12,17 @@ console.log(`The percentage change is ${percentageChange}`);
 // Read the code and then answer the questions below
 
 // a) How many function calls are there in this file? Write down all the lines where a function call is made
+//There are two function calls here. replaceAll and console.log
+
 
 // b) Run the code and identify the line where the error is coming from - why is this error occurring? How can you fix this problem?
+//LIne 5 was missing a separation comma
 
 // c) Identify all the lines that are variable reassignment statements
+// Line 4 and LIne 5 have variables being reassigned.
 
 // d) Identify all the lines that are variable declarations
+// Line 1, line 2, line 7 and line 8 have variable declarations
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+//This expression removes the comma in the price from 10,000 to 10000

Sprint-1/3-mandatory-interpret/2-time-format.js

@@ -12,14 +12,20 @@ console.log(result);
 // For the piece of code above, read the code and then answer the following questions
 
 // a) How many variable declarations are there in this program?
+// There are 6 variable declarations
 
 // b) How many function calls are there?
+// There is one function call which is console.log
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+// % is a remainder operator which will do movieLength / 60 and we will consider the remainder of this operation
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// In line 4 we are declaring the totalMinutes. we have the remainingSeconds which is 24. Then we will do ((8784 - 24) /60) =  146
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// The variable result shows the total remaining duration of a movie in terms of hours, minutes and seconds
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// The movieLength code will work work with all kinds of number. THat is integers and floats. It will not work with strings

Sprint-1/3-mandatory-interpret/3-to-pounds.js

@@ -25,3 +25,10 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 2. const penceStringWithoutTrailingP = "399p".substring( 0,  penceString.length - 1): Here we use the subString method which will slide the string of 
+// penceString starting at index 0 and ending at index 2 (3 - 1). The result should be "399"
+// 3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"): Here we want to make sure that the penceStringWithoutTrailingP variable has at least 3 characters, if that is not the case, we will add "0" infront of the character till it reaches the length required.
+// Here, paddedPenceNumberString = "399" . Then pounds =  "3"
+// 4. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0") : The substring(paddedPenceNumberString.length - 2) will return 99  and the padEnd(2,"0") will make sure that there are at least two characters here.
+
+

Sprint-1/4-stretch-explore/chrome.md

@@ -11,8 +11,11 @@ In the Chrome console,
 invoke the function `alert` with an input string of `"Hello world!"`;
 
 What effect does calling the `alert` function have?
+Answer: It creates a pop up window on the browser.
 
 Now try invoking the function `prompt` with a string input of `"What is your name?"` - store the return value of your call to `prompt` in an variable called `myName`.
 
 What effect does calling the `prompt` function have?
+Answer: It creates a pop up window which allows the user to input data. This prompt has a cancel and an 'OK' button.
 What is the return value of `prompt`?
+Answer: The return value will depend on what the user inputs. If the user presses the 'cancel' button, then the return is null. If the user presses 'OK' without entering anything, then the return type is an empty string. Else if something is written by the user, then the return value will be what the user has entered.

Sprint-1/4-stretch-explore/objects.md

@@ -5,12 +5,20 @@ In this activity, we'll explore some additional concepts that you'll encounter i
 Open the Chrome devtools Console, type in `console.log` and then hit enter
 
 What output do you get?
+ANswer: I get this ƒ log() { [native code] }
 
 Now enter just `console` in the Console, what output do you get back?
+Answer: {debug: ƒ, error: ƒ, info: ƒ, log: ƒ, warn: ƒ, …}
 
 Try also entering `typeof console`
+Answer: object
 
 Answer the following questions:
 
 What does `console` store?
+Answer: Console stores a lot of objects like assert, clear, error, info, warn, log, debug and more.
+
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+Answer: Console.log helps to print out a message.
+Console.assert writes an error message to the console if the assertion is false. If the assertion is true, nothing happens.
+`.` is used to access the properties or methods of an object

Sprint-2/1-key-errors/0.js

@@ -1,13 +1,22 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// I believe the code is trying to write the first letter of a string on capital letter. But since the "str" declaration has already been used, we will need a new name
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
 
-function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return str;
-}
+// function capitalise(str) {
+//   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+//   return str;
+// }
 
-// =============> write your explanation here
+// =============> write your explanation here: //There is a SynthaxError on line 9 of the code when we try to declare a new variable with the name "str". This is because the "str" name has already been used when declaring the function "capitalise".
 // =============> write your new code here
+function capitalise(str) {
+   let name = `${str[0].toUpperCase()}${str.slice(1)}`;
+   return name;
+ }
+ let str = "emma";
+ console.log(capitalise(str));
+
+

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

@@ -1,20 +1,30 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// Here the name decimalNumber in 'const decimalNumber' has already been used, so we will get a synthax Error for that line. 
 
 // Try playing computer with the example to work out what is going on
 
+// function convertToPercentage(decimalNumber) {
+//   const decimalNumber = 0.5;
+//   const percentage = `${decimalNumber * 100}%`;
+
+//   return percentage;
+// }
+
+// console.log(decimalNumber);
+
+// JavaScript is read from top to bottom, so when the processor reads an error, the program will stop running and will get the error message.
+//The first error is on line 9 with the reuse of the variable declaration name of 'decimalNumber.
+//The second error is on line 15 where we are trying to call the variable 'decimalNumber',which is a local variable inside the function. We cannot access this variable outside of the function. We will need to call the whole function.
+// Finally, correct the code to fix the problem
+// =============> write your new code here
 function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
+  const decimalNumber1 = 0.5;
+  const percentage = `${decimalNumber1 * 100}%`;
 
   return percentage;
 }
 
-console.log(decimalNumber);
-
-// =============> write your explanation here
+console.log(convertToPercentage());
 
-// Finally, correct the code to fix the problem
-// =============> write your new code here

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

@@ -3,18 +3,22 @@
 
 // this function should square any number but instead we're going to get an error
 
-// =============> write your prediction of the error here
+// =============> write your prediction of the error here: There will be an error because we put a value (3) as a function's parameter instead of using variable names. We also don't know where num comes from as we have't defined/ declared that. 
 
-function square(3) {
-    return num * num;
-}
+// function square(3) {
+//     return num * num;
+// }
 
-// =============> write the error message here
+// =============> write the error message here: SyntaxError: Unexpected number
 
-// =============> explain this error message here
+// =============> explain this error message here: We get an error message saying that there is an unexpected number on line 8 (Syntax Error).
 
 // 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 +1,19 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> write your prediction here: There is no return value value for the function multiply. Though it print the value of a * b in the function, this function cannot be called outside of the function (on line 9). So, it will be undefinded. WE need a return
 
-function multiply(a, b) {
-  console.log(a * b);
-}
+// function multiply(a, b) {
+//   console.log(a * b);
+// }
 
-console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+// console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
-// =============> write your explanation here
+// =============> write your explanation here: We need to change console.log on line 6 to return so that we can call in outside of the function.
 
 // 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 +1,18 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> write your prediction here: There is a semi column on line 5 after the return which separates it from line 6. We don't know what we are returning.
 
-function sum(a, b) {
-  return;
-  a + b;
-}
+// function sum(a, b) {
+//   return;
+//   a + b;
+// }
 
-console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+// console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
-// =============> write your explanation here
+// =============> write your explanation here: SInce we don't know what we are returning, we will get an undefined value for the function. 
 // 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 and 32 is ${sum(10, 32)}`);

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

@@ -1,24 +1,33 @@
 // Predict and explain first...
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============> Write your prediction here: We are trying to convert the last figure (last index) of a number to a String. We will surely get "2", "5" and "6"
 
-const num = 103;
+// const num = 103;
 
-function getLastDigit() {
-  return num.toString().slice(-1);
-}
+// function getLastDigit() {
+//   return num.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)}`);
+// 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
+// =============> write the output here: After running our code, we saw that it printed "3" all over. Which comes from our initial declaration of num = 103
 // Explain why the output is the way it is
-// =============> write your explanation here
+// =============> write your explanation here: We have declared num as a const which makes it unchangeable through out. We cannot redeclare it. The second thing is that we will need to add num inside of the parameter of the function.
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+let num = 103;
+
+function getLastDigit(num) {
+  return num.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)}`);
 
 // 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 +15,9 @@
 // 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 divide = weight / squareHeight;
+    let BMI = divide.toFixed(2);
+    return BMI;
+}
+console.log(calculateBMI(70, 1.73));