Glasgow | 26-ITP-JAN | Prakash Dcosta | Sprint 1 | Structuring and Testing Data

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

@@ -3,4 +3,4 @@ let count = 0;
 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 adding 1 to the initial count of 0 which is given in the variable declaration (Describe what line 3 is doing, in particular focus on what = is doing)

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 +17,10 @@ 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 = ;
+const dir = filePath.slice(0,lastSlashIndex);
+const lastDotIndex = filePath.lastIndexOf(".");
+const ext = filePath.slice(lastDotIndex + 1);
+console.log (`The dir part of the filePath variable is ${dir}`);
+console.log (`The ext part of the variable is ${ext}`);
 
 // https://www.google.com/search?q=slice+mdn

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

@@ -3,7 +3,12 @@ const maximum = 100;
 
 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
+// In this exercise, you will need to work out what num represents? Num represents a randomly selected number from >=1 till <=100
+// Try breaking down the expression and using documentation to explain what it means. 
+// Function Math.random() generates a decimal number between 0 to 1 which is 0 to 0.9999
+// Funcion (maximum-minimum + 1). Therefore it is 100 - 1 + 1 = 100
+// The * sign will multiply the random number with 100 which becomes 0 to 99.99
+// The function Math.floor will unconditionally round it down. Hence it will be 0 to 99
+// + minimum will add 1 to the new rounded up number Hence the old rance 0 - 99 will now become 1 to 100
 // 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
+// Done - Try logging the value of num and running the program several times to build an idea of what the program is doing

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?
+// we add the double slash which treats it like a comment for human consumption

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

@@ -1,4 +1,5 @@
 // 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 +1,6 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
-// what's the error ?
+// what's the error ? We cannot declare after execution. We need to declare first
 
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+

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

@@ -1,8 +1,11 @@
-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
+// since it was not in quotes
 // 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?

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

@@ -1,2 +1,4 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const Clock12HourTime = "20:53";
+const Clock24HourTime = "08:53";
+
+// The varialble cannot start with a number of function

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 +12,16 @@ 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 3 function calls on line 4,5 & 10
 
 // 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 on line 5. It is missing a , syntax. I have fixed it
 
 // c) Identify all the lines that are variable reassignment statements
+// Lines 4 & 5 are variable reassignment statements
 
 // d) Identify all the lines that are variable declarations
+// Variable declarations are lines 1,2,7 & 8
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// This expression is removing the , between the car price and making it into a number without ,

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

@@ -12,14 +12,17 @@ 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 in this program
 
 // b) How many function calls are there?
+// There is 1 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
-
+// % 60 is a remainder operator which in this case divides the total by 60 and shares the remainder (seconds / minutes)
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
-
+// It gives the total number of minutes in the movie, ignoring any leftover seconds.
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
-
+// The variable result represents the time of the movie in Hours Mintutes and seconds. We could use time instead of result
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// Yes. This code will work for all values of movie length. Decimal numbers or string, NAN, undefined or Null could break the code.

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

@@ -25,3 +25,9 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 2. Line 3 Removes the letter p from the end of the string
+// 3. Line 8 keeps the length to 3 and adds a 0 if the length is smaller like 50p -> 050 or 5p -> 005
+// 4. Line 9 calculates the pounds part from the amount by taking all digits except the last two.
+// 5. Line 14 displays the pence of the remaining 2 digits
+// 6. Line 18 converts and displays the output result on the terminal of the total in currency format of £whole with pence after the decimal
+