Manchester | ITP-May-2025 | Chukwuemeke Ajuebor | Module-Structuring-and-Testing-Data | Sprint-1

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

@@ -4,3 +4,4 @@ count = count + 1;
 
 // 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 'assigning' count to a value of the original value of count, plus one.  

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

@@ -5,7 +5,8 @@ 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 initials = `${firstName[0]}${middleName[0]}${lastName[0]}`;
+console.log(initials)
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
 

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

@@ -17,7 +17,16 @@ 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
 
-const dir = ;
-const ext = ;
+//To get the directory path we have to get a slice between two point,
+//the beginning and the start of the last slash index which is stored 
+//in the variable lastSlashIndex."""
+
+const dir = filePath.slice(0, lastSlashIndex);
+console.log(`The directory part of ${filePath} is "${dir}".`)
+
+// To get the directory path we have to create last index of . as well
+let lastDotIndex = filePath.lastIndexOf(".");
+const ext = filePath.slice(lastDotIndex) ;
+console.log(`The extension part of ${filePath} is "${ext}".`)
 
 // https://www.google.com/search?q=slice+mdn

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

@@ -6,4 +6,10 @@ const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 // In this exercise, you will need to work out what num represents?
 // 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
+// - Math.random() will create a floating point (decimal) between 0 and 1 but always less than 1.
+// - Math.floor() gets the decimal multiplied by 100 and strips it down to the nearest whole number (integer)
+
 // Try logging the value of num and running the program several times to build an idea of what the program is doing
+// The first part of the num expression ensures we have a two digit number between 0 and 99. And the best we can get is 99.
+// The addition of the minimum, 1 in this case ensures num can also be 100.
+// This ensures that both the "minimum" and "maximum" value can be part of the range of generated answers for the "num" variable.

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

@@ -1,2 +1,4 @@
-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?
+
+//we can solve this by simply using the double forward slash (quote sign)

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

@@ -2,3 +2,6 @@
 
 const age = 33;
 age = age + 1;
+
+//TypeError: Assignment to constant variable. 
+// The second line clearly will not work since age was declared to be constant and CANNOT change.

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

@@ -1,5 +1,8 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
 // what's the error ?
+// It is a reference error and it is as a result of the variable being accessed before it is created
+// The first line shoulfd come before the second line
 
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+

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

@@ -1,9 +1,14 @@
-const cardNumber = 4533787178994213;
+const cardNumber = "4533787178994213";
 const last4Digits = 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
+
+// The code won't work because the variable "cardNumber" is not a string.
+// Since it is a constant variable, we will have to change directly by putting quote signs around it to make it a string. 

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

@@ -1,2 +1,10 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+//const 12HourClockTime = "20:53";
+//const 24hourClockTime = "08:53";
+
+// In the above, error will occur as  Variable names are not allowed to start with a number.
+// This means that we must modify the names slightly. 
+
+const Hour24ClockTime = "20:53";
+const Hour12ClockTime = "08:53";
+
+console.log(Hour24ClockTime)

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 +12,14 @@ 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  three; Ln4, Ln5, Ln10.
 // 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?
-
+// the error is as a result of the two arguments in Ln5 not being seperated
 // c) Identify all the lines that are variable reassignment statements
-
+// Ln4, Ln5,
 // d) Identify all the lines that are variable declarations
+// Ln1, Ln2, Ln7 and Ln8
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// The purpose is to take replace the commas in the number with "nothing" so that 
+// the number string can be converted to an actual number. 

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

@@ -1,4 +1,4 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = 34; // length of movie in seconds
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
@@ -12,14 +12,21 @@ 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 no function call.
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+// That is the remainder operator and outputs the leftover after division of one operand by the other.
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+//It takes the total movie duration in seconds and removes the remainder that would come about if the
+//total seconds were divided by 60: That way, line4 is sure to bring a whole number back.  
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+//It represents the movie duration in the format; HH:MM:SS. A good name would be "movieduration"
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// Yes it will as long as the minimum movielength is 1 sec. The divided operand will always be returned if the dividing operand can go into it.

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

@@ -1,4 +1,4 @@
-const penceString = "399p";
+const penceString = "1509p";
 
 const penceStringWithoutTrailingP = penceString.substring(
   0,
@@ -23,5 +23,13 @@ console.log(`£${pounds}.${pence}`);
 // You need to do a step-by-step breakdown of each line in this program
 // Try and describe the purpose / rationale behind each step
 
-// To begin, we can start with
+// Rational behind each step
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 2. Lns3-6 strip off the p using .substring() with indexing
+// 3. Ln8 limits the string characters to 3 and will pad up from the front with zeros to get 
+// the 3 characters. it uses the pad.start() method with the arguments (3,"0")
+// 4. Lns9-12 uses substring method again to fetch out the first character only.
+// 5. Lns14-16 fetches the last two characters using the substring method again and uses the 
+// padstart method to make use there will always be a "0" added to make sure it is two characters 
+// if needed.
+// Ln18 outputs the pound and pence literals