Manchester | 26-ITP-May | Joanne O’Malley | Sprint 1 | Coursework

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

@@ -2,5 +2,9 @@ let count = 0;
 
 count = count + 1;
 
+// The single equals means assignment. 
+// It is saying the value of count is now the previous value of count plus one.  
+//If it was == or ===, it would be testing equality and asking if count (0) is equal to 0+1 which would give false.
+
 // 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

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 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);
+console.log(`The dir part of ${filePath} is ${dir}`);
 
-// https://www.google.com/search?q=slice+mdn
+const ext = base.split(".").slice(1)
+console.log(`The ext part of ${filePath} is ${ext}`);
+
+// https://www.google.com/search?q=slice+mdn

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

@@ -7,3 +7,10 @@ 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
+
+// get the maximum minus minimum
+// add 1 to count the edges and avoid the fencepost error
+// this generates the correct span
+// add the minimum on so it starts at the right number
+// multiply it by a random decimal between 0 and 1 
+// round it down to the next whole number down

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

@@ -1,2 +1,2 @@
-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?

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

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

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

@@ -1,5 +1,5 @@
 // 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}`);

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

@@ -1,5 +1,6 @@
-const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const cardNumber = "4533787178994213";
+const last4Digits = cardNumber.slice(cardNumber.length-4,cardNumber.length);
+console.log(last4Digits)
 
 // The last4Digits variable should store the last 4 digits of cardNumber
 // However, the code isn't working

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

@@ -1,2 +1,2 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const TwelveHourClockTime = "20:53";
+const TwentyFourHourClockTime = "08:53";

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
+// Five: two on line 4, two on line 5 and one on line 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?
+// Comma was missing on line 5.  I've added it, the second comma here: .replaceAll(",","")
 
 // c) Identify all the lines that are variable reassignment statements
+// lines 4 and 5
 
 // d) Identify all the lines that are variable declarations
+// lines 1, 2, 7 and 8
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// It takes the comma out of the numbers so it can be converted to a number one can do calculations with.  The commas are just to make it more readable for humans.

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?
+// 6
 
 // b) How many function calls are there?
+// 1
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+// It's modulo.  In this case, it gives the remainder of seconds after one gets the number of minutes by dividing by 60.
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// It avoids using floor division, so it's more comprehensible to beginners, by subtracting the remaining seconds from the film length.  The it divides by 60 to get hours.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// It shows the time in hours, minutes and seconds.  You could call it timeHoursMinsSecs
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// It wouldn't work well if the user typed the answer as a string.  The input is unlikely to be negative or run over a day or have a user finnicky enough to state seconds with a decimal.  It might look nicer if it was padded with zeros.

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

@@ -1,16 +1,21 @@
 const penceString = "399p";
 
+// remove last character
 const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
 );
 
+// pad to the length of three
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+
+// remove the last two characters
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
 );
 
+// get last two characters and pad to two if needed
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
   .padEnd(2, "0");
@@ -25,3 +30,9 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+
+// penceStringWithoutTrailingP: remove last character
+// paddedPenceNumberString: pad to the length of three
+// pounds: remove the last two characters of paddedPenceNumberString
+// pence: get last two characters and pad to two if needed
+// log to the console in the format £[pounds].[pence]