Manchester | 26-ITP-Sep | Gustarv Nchitu | Sprint 2 | Coursework/sprint 2

Sprint-2/1-key-exercises/1-count.js

@@ -4,3 +4,5 @@ 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 updating the value of the variable `count`. The `=` operator is an assignment operator, which means it takes the value on the right side (in this case, `count + 1`) and assigns it to the variable on the left side (`count`). So, it takes the current value of `count`, adds 1 to it, and then stores that new value back into `count`.

Sprint-2/1-key-exercises/2-initials.js

@@ -5,6 +5,7 @@ const 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.
 
-const initials = ``;
+const initials =firstName[0] + middleName[0] + lastName[0];
 
+console.log(initials);
 // https://www.google.com/search?q=get+first+character+of+string+mdn

Sprint-2/1-key-exercises/3-paths.js

@@ -11,13 +11,16 @@
 
 const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
 const lastSlashIndex = filePath.lastIndexOf("/");
+//console.log(lastSlashIndex);
 const base = filePath.slice(lastSlashIndex + 1);
-console.log(`The base part of ${filePath} is ${base}`);
+//console.log(base)
+//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 ext = filePath.slice(filePath.lastIndexOf("."));
+console.log(dir);
+console.log(ext);
 // https://www.google.com/search?q=slice+mdn

Sprint-2/1-key-exercises/4-random.js

@@ -2,7 +2,7 @@ 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

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

@@ -1,4 +1,12 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+//const age = 33;
+//age = age + 1;
+
+// We use let because the value of age needs to change.
+
+
+let age = 33;
+
 age = age + 1;
+console.log(age);

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

@@ -1,5 +1,12 @@
 // 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}`);
+//console.log(`I was born in ${cityOfBirth}`);
+//const cityOfBirth = "Bolton";
+
+// Currently trying to print the string "I was born in Bolton" but it isn't working...
+// what's the error ?
+
 const cityOfBirth = "Bolton";
+
+console.log(`I was born in ${cityOfBirth}`);

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

@@ -1,9 +1,15 @@
-const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+//const cardNumber = 4533787178994213;
+//const last4Digits = cardNumber.slice(-4);
 
 // The last4Digits variable should store the last 4 digits of cardNumber
 // However, the code isn't working
 // 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?
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+
+// I predict the code will give an error because cardNumber is a number, and slice() works on strings.
+//const last4Digits = String(cardNumber).slice(-4);
+const cardNumber = 4533787178994213;
+
+const last4Digits = String(cardNumber).slice(-4);

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

@@ -1,2 +1,4 @@
 const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+//const 24hourClockTime = "20:53";
+// I predict the code will give an error because a variable name cannot start with a number.
+const twelveHourClockTime = "8:53pm";

Sprint-2/3-mandatory-interpret/1-percentage-change.js

@@ -2,13 +2,12 @@ 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;
 
 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
@@ -19,4 +18,19 @@ 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?
+// e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of thi e() and Number().
+
+//a) There are 4 function calls. They are on lines 4 and 5. Each line contains two function calls: replaceAll() and Number().
+//b) The error comes from line 5. The replaceAll() function is missing a comma between its two arguments. The problem can be fixed by adding a comma: replaceAll(",", "").
+//priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
+//c) The variable reassignment statements are lines 4 and 5.
+//d) The variable declaration statements are lines 1, 2, 7 and 8.
+
+//e) The expression removes the comma from the price string and then converts the result from a string into a number, so JavaScript can use it for calculations.
+
+//carPrice = Number(carPrice.replaceAll(",", ""));
+//priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));
+
+//const priceDifference = carPrice - priceAfterOneYear;
+//const percentageChange = (priceDifference / carPrice) * 100;
+

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

@@ -23,3 +23,11 @@ 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
+
+// a) There are 6 variable declarations.
+// b) There is 1 function call. It is on line 10: console.log(result);
+// c) The % operator gives the remainder after dividing movieLength by 60.
+// c) The % operator gives the remainder after dividing movieLength by 60. 60 represents the number of seconds in one minute.
+// d) It subtracts the remaining seconds from the movie length and then divides by 60 to convert the remaining seconds into total minutes.
+// e) The variable result represents the movie duration in hours, minutes and seconds. A better name would be movieDuration.
+// f) The code works for different positive values of movieLength because it converts seconds into hours, minutes and seconds. It expects movieLength to be a number representing seconds.

Sprint-2/3-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. const penceStringWithoutTrailingP = ...: removes the final "p" from "399p", leaving "399"
+// 3. padStart(3, "0"): makes sure the pence string has at least 3 characters by adding zeros to the beginning if needed.
+// 4. const pounds = ...: takes all the characters except the last two, giving the pounds part of the price.
+// 5. const pence = ...: takes the last two characters as the pence part and makes sure it has two characters.
+// 6. console.log(`£${pounds}.${pence}`): displays the final price in pounds and pence format.

Sprint-2/4-stretch-explore/chrome.md

@@ -13,3 +13,6 @@ Now try invoking the function `prompt` with a string input of `"What is your nam
 
 What effect does calling the `prompt` function have?
 What is the return value of `prompt`?
+Calling the alert function displays a pop-up message to the user.
+
+Calling the prompt function asks the user for information. The return value of prompt is the information the user entered.

Sprint-2/4-stretch-explore/objects.md

@@ -9,7 +9,9 @@ What output do you get?
 Now enter just `console` in the Console, what output do you get back?
 
 Try also entering `typeof console`
+The console stores an object containing functions and other properties used for interacting with the console.
 
+The syntax console.log or console.assert accesses a function that belongs to the console object. The . means access a property or function that belongs to an object.
 Answer the following questions:
 
 What does `console` store?