Cape Town | 25-ITP-May | Asanda Dunn | Sprint 1 | Coursework/sprint 1

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

@@ -2,5 +2,8 @@ let count = 0;
 
 count = count + 1;
 
+// line basically modifies the variable count by updating and adding 1 to it. So basically count is now equal to the current count + 1. In this instance 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

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

@@ -13,11 +13,14 @@ const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
 const lastSlashIndex = filePath.lastIndexOf("/");
 const base = filePath.slice(lastSlashIndex + 1);
 console.log(`The base part of ${filePath} is ${base}`);
+console.log(lastSlashIndex)
+console.log(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 ext = base.slice(4,8);
+console.log(ext)
+console.log(dir)
 // https://www.google.com/search?q=slice+mdn

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

@@ -2,8 +2,24 @@ const minimum = 1;
 const maximum = 100;
 
 const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
-
+console.log(num)
 // 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
 // Try logging the value of num and running the program several times to build an idea of what the program is doing
+
+//ANSWER
+// num represents random whole numbers between 1 and 100 
+
+// Math.floor is a built in function in JavaScript which basically rounds down a number to 
+// its nearest whole integer.
+
+//Math.random is also a built in function for selecting random numbers in this case
+//numbers that are between 1 and 100
+
+//Therefore num is equal to the a randomly selected number that has been
+// rounded down to its nearest whole integer times (maximum - minimum + 1) + minimum
+//the computer solves the expression in the bracket first as per mathematics order of operation
+// rules so the expression shrinks to Math.floor(math.random()*100) + 1)
+// so whatever the random value that the computer generates will be multiplied by 100 and rounded 
+// or floored down to it's nearest whole integer plush1 

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

@@ -1,2 +1,5 @@
-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 don't want the computer to run these 2 lines - how can we solve this problem?
+
+// This is a a syntax error. This text is supposed to be commented out in order for us to not run into this error
+//  we should add // so that the computer doesn't try to run this text as code .
+

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

@@ -1,4 +1,7 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+let age = 33;
 age = age + 1;
+
+// the variable age has been declared as constant in order to fix this age will
+// need to be declared using let so that it's values can be reassigned

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 ?
-
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);
+
+
+// The variable city of birth needs to be declared first before attempting to 
+// print the string 

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
+
+//Prediction the cardNumber is not a string since it is not in "" so I don't 
+// think the slice() function will work
+
+// After running the code I got a TypeError

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

@@ -1,2 +1,2 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+const TwelveHourClockTime = "8:53pm";
+const TwentyFourHourClockTime = "20:53";

Sprint-1/3-mandatory-interpret/1-percentage-change.js

@@ -2,7 +2,8 @@ let carPrice = "10,000";
 let priceAfterOneYear = "8,543";
 
 carPrice = Number(carPrice.replaceAll(",", ""));
-priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+// console.log(carPrice)
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
 
 const priceDifference = carPrice - priceAfterOneYear;
 const percentageChange = (priceDifference / carPrice) * 100;
@@ -20,3 +21,17 @@ console.log(`The percentage change is ${percentageChange}`);
 // d) Identify all the lines that are variable declarations
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+
+
+
+// a) There are 2 function calls in this code. replaceAll() in line 4 and 5 and console.log() in line 10
+
+// b) There is a SyntaxError on line 5. The replaceAll() function takes 2 arguments 
+// and this is missing a comma between the 2 arguments 
+
+//c) line 4 & 5
+
+// d) line 1,2 7 & 8
+
+// e) It is replaces the comma "," in carPrice and removes any spaces so 
+// everything becomes one string

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

@@ -1,4 +1,4 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = 10652; // length of movie in seconds
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
@@ -23,3 +23,18 @@ console.log(result);
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+
+// Answers 
+
+// a) 6
+
+// b) One function call is on this code - console.log() in line 10.
+
+// c) The remainder (%) operator returns the remainder left over when one operand is divided by a second 
+// operand. It always takes the sign of the dividend.
+
+// d) In line 4 the totalHours is calculated by subtracting the remainingMinutes from the totalMinutes and then dividing that answer by 60
+
+// e) It is a string representing the time movie time in hours, minutes and seconds
+
+// f) yes, because the variables for calculating the results use a formulas that will work with any number that is assigned to the movieLength variable

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

@@ -4,17 +4,20 @@ const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
 );
+// console.log(penceStringWithoutTrailingP);
 
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+// console.log(paddedPenceNumberString);
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
 );
+// console.log(pounds)
 
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
   .padEnd(2, "0");
-
+// console.log(pence)
 console.log(`£${pounds}.${pence}`);
 
 // This program takes a string representing a price in pence
@@ -24,4 +27,30 @@ console.log(`£${pounds}.${pence}`);
 // Try and describe the purpose / rationale behind each step
 
 // To begin, we can start with
+
+// Answers
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 2. const penceStringWithoutTrailingP = penceString.substring(0, penceString.length-1): this 
+// variable creates a new string that cuts the penceSting to 399,so it basically creates a new
+// string from index 0, and removes the last index
+// 3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"); this variable sets 
+// the penceStringWithoutTrailingP string length to 3, and if the length is shorter than 3 it adds 
+// "0" in front. 
+// 4. const pounds = paddedPenceNumberString.substring(0,paddedPenceNumberString.length - 2)
+// this variable uses the subString function to further slice the paddedPenceNumberString
+// string on from the first index and remove the last 2 parts of in. In this case the string goes 
+// from '399' to just '3' 
+
+// 5.const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0");
+// this variable creates a new string from the paddedPenceNumberString variable using the subString 
+// function. This time it creates a new string from the last 2 indexes. Furthermore it sets the target 
+// length for this new variable to 2 and if is is less than 2 it sets a condition to add
+// a "0" at the end by using the padEnd() function
+
+
+//6. console.log(`£${pounds}.${pence}`); this is a function call that displays the final amount in 
+// pounds. It uses string interpolation to directly use the variable values pound and pence and also
+//  formats the string by adding £ before the values. So the output displayed will be £3.99
+
+
+

Sprint-1/4-stretch-explore/chrome.md

@@ -11,8 +11,11 @@ In the Chrome console,
 invoke the function `alert` with an input string of `"Hello world!"`;
 
 What effect does calling the `alert` function have?
+I get a pop up message that says chrome://new-tab-page-third-party says Hello,World!
 
 Now try invoking the function `prompt` with a string input of `"What is your name?"` - store the return value of your call to `prompt` in an variable called `myName`.
 
 What effect does calling the `prompt` function have?
+I get a pop up message on my screen that says "what is your name?" and it allows me to enter my name.
 What is the return value of `prompt`?
+It returns the name that I type, Asanda

Sprint-1/4-stretch-explore/objects.md

@@ -5,12 +5,17 @@ In this activity, we'll explore some additional concepts that you'll encounter i
 Open the Chrome devtools Console, type in `console.log` and then hit enter
 
 What output do you get?
+f log(){[native code]}
 
 Now enter just `console` in the Console, what output do you get back?
 
+console{debug:f,error:f, info:f, log:f, warn:f,...} and a list of other functions
+
 Try also entering `typeof console`
 
 Answer the following questions:
 
 What does `console` store?
+It stores the object
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+the "." is an access operator which allows you to access  the log or assert method.