Glasgow | 26-ITP-JAN | Prakash Dcosta | Sprint 1 | Structuing 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 round the new number to the nearest whole number. 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?
-
+// The expression assigned to total minutes is the difference of the total movie time in seconds less the remainder of the seconds divided by 60 which gives the total length of the movie in minutes
 // 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. I tried with 8400 seconds and 8405 seconds

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 displays pounds from the 1st digit of the 3
+// 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
+