Manchester | 26-ITP-Jan | Farancis Dore Etonkie |Sprint 1 |Structuring and testing data

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

@@ -1,6 +1,6 @@
 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
+//This means that increase the count number by 1 (by adding 1 to the initial number) and maintain the count value after adding 1. E.g 0+1 =1, so the new count now will be 1. 

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];
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
 
+console.log (initials);

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);
+
+// https://www.google.com/search?q=slice+mdn
+
 
-// https://www.google.com/search?q=slice+mdn

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

@@ -7,3 +7,19 @@ 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
+
+
+//ANSWERS:
+// Num represents a random whole number(integers).  In which in this case it can be between 1 to 100.
+//Now let me break it down;
+
+//This const minimum = 1; and this const maximum = 100; represent the range from which i want my random numbers to come from.
+
+//This command Math.random() generates a random decimal number from 0(being inclusive) to 1(but not inclusing 1) e.g 0.23, 0.87, 0.001 or 0.999 but it will never generate 1. 
+// This command (maximum - minimum + 1) is a calculation of the Maximum and Minimum number i.e, 100-1+1=100
+// This command Math.floor helps to remove any decimal point and round numbers down to the nearest whole number. e.g from 45.9 to 45
+// This command +Minimum helps to add the minimum number in our range inorder to increase the numbers to 100(incusive)
+
+console.log (num)
+
+//After logging and running num, I had these series of numbers: 12, 66, 36,64,9,91....

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

@@ -1,2 +1,6 @@
-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?
+
+//Answer:
+
+//By turning them into comments(by using //) just like this setence. 

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

@@ -1,4 +1,9 @@
 // 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);
+
+
+//I had to change the variable (const) to (let) because a value assigned to (const) can not be assign again, while with (let) it can be reassigned

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

@@ -1,5 +1,7 @@
 // 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}`);
+
+//It is important to declare a variable before using it.

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

@@ -1,4 +1,4 @@
-const cardNumber = 4533787178994213;
+const cardNumber = "4533787178994213";
 const last4Digits = cardNumber.slice(-4);
 
 // The last4Digits variable should store the last 4 digits of cardNumber
@@ -7,3 +7,8 @@ const last4Digits = cardNumber.slice(-4);
 // 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
+
+console.log(last4Digits)
+
+
+//The number attributed to the value cardNumber is not a String, so we need to make the make a string. 

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

@@ -1,2 +1,7 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const formatAs12HourClockTime = "20:53";
+const formatAs24hourClockTime = "08:53";
+
+console.log(formatAs12HourClockTime)
+console.log(formatAs24hourClockTime)
+
+//Variable names do not start with numbers. 

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;
@@ -11,12 +11,23 @@ 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
+// a) How many function calls are there in this file? Write down all the lines where a function call is made:
+// 5 which are: 2 number(), 2 replaceAll() and 1 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?
+// The error is on line 5, there is a missing comma that needs to seperate the arguments of replaceAll().Will fix it by putting the comma. 
 
 // c) Identify all the lines that are variable reassignment statements
+// Line 4 and 5
 
 // d) Identify all the lines that are variable declarations
+// Line 1, 2, 7 and 8
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// The purpose is to:
+
+// Remove formatting (commas) from a number string
+
+// Convert the cleaned string into a real number
+
+// Allow mathematical calculations to be performed

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

@@ -12,14 +12,22 @@ 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?
+// 6 variable declaration. Which are movieLength, remainingSeconds, totalMinutes, remainingMinutes, totalHours, result
 
 // b) How many function calls are there?
+// 1 functions, which is Console.log
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
+// It represents the remainder expression. This means that the remainder operator returns the remainder left over when one operand is divided by a second operand.
+//
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// This command calculate the number of hours in the expression then extract the leftover minutes. 
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// It creates a formated string. for example: 2:30:23. That is the movie duration formated in Hours:Minutes:Seconds. 
+//Better names could be; FormatedDuration or MovieDuration or FormatedTime. 
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// It would Works for positive integers only; not ideal for negatives, decimals, or proper formatting. 

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

@@ -25,3 +25,22 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+//For line 3 and 5 (const penceStringWithoutTrailingP = penceString.substring 0, penceString.length - 1)= substring(start, end) extracts part of a string.
+
+//0 means start at the beginning.
+
+//penceString.length - 1 means stop before the last character.
+
+//For "399p":
+
+//length = 4
+
+//4 - 1 = 3
+
+//substring from 0 to 3 → "399"
+
+// The purpose is to;
+
+//Removes the "p" at the end of the string.
+
+//Leaves only the numeric value "399"