CApe Town | May -ITP-26| Enice Mutanda|Sprint 1|Coursework

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

@@ -2,5 +2,15 @@ let count = 0;
 
 count = count + 1;
 
-// Line 1 is a variable declaration, creating the count variable with an initial value of 0
+
+// Line 3 reassigns the value of count.
+//  count = 0 +1 ;
+// count = 1
+
+// The expression on the right side (count + 1) is evaluated first using the current value of count.
+// The =  assignment operator then stores the result back into the count variable, replacing its previous value.
+
+
+// Line 1 is a variablbe declaration, creating the count variable with an initial value of 0
 // Describe what line 3 is doing, in particular focus on what = is doing
+// In line 3 the = operator assigns a new value to the variable count.

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

@@ -5,7 +5,7 @@ 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
 
+// https://www.google.com/search?q=get+first+character+of+string+mdn

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

@@ -1,6 +1,5 @@
 // The diagram below shows the different names for parts of a file path on a Unix operating system
 
-// ┌─────────────────────┬────────────┐
 // │          dir        │    base    │
 // ├──────┬              ├──────┬─────┤
 // │ root │              │ name │ ext │
@@ -15,9 +14,14 @@ const base = filePath.slice(lastSlashIndex + 1);
 console.log(`The base part of ${filePath} is ${base}`);
 
 // Create a variable to store the dir part of the filePath variable
+
+const dir = filePath.slice (0,lastSlashIndex);
+
 // Create a variable to store the ext part of the variable
 
-const dir = ;
-const ext = ;
+const ext = base.slice(base.lastIndexOf(".") + 1);
+
+// https://www.google.com/search?q=slice+mdn
 
-// https://www.google.com/search?q=slice+mdn
+// dir = everything before the last /
+// ext = everything from the last . to the end of the string (.txt)ssss

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

@@ -1,9 +1,19 @@
-const minimum = 1;
-const maximum = 100;
+const minimum = 3;
+const maximum = 50;
 
 const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 
 // In this exercise, you will need to work out what num represents?
+// the num is random number between 1 and 100.
 // Try breaking down the expression and using documentation to explain what it means
+// const minimum is a function expression
+// = 1 is a minimum value assigned by the operator for the minimum 
+// = 100  is the maximum value assigned by the operator for the function.
+
+// Method.floor generates a random number between 0 and 1 to nearest interger (whole number)
+//Math.random generates a decimal number between 0 and 1 .
+
 // 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
+console.log(num);
+// I noticed that the different values change the print result .

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

@@ -1,2 +1,8 @@
 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?
+
+
+//his 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 can use //to comment out the lines of code we don't want to run.

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;
-age = age + 1;
+let age = 33;
+age = 33 + 1;
+console.log(age);

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 error is that the variable cityOfBirth is being use in the console.log statement  before it is declared with let or const unlike var.
+

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

@@ -1,9 +1,26 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
 
-// The last4Digits variable should store the last 4 digits of cardNumber
+const last4Digits =  String(cardNumber).slice(-4);
+
+
+console.log(last4Digits); // "4213"
+
+
+ //.slice () works on arrays and strings
+
+
 // 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.
+ // I ran the code the error i got was excatly as predicted.
+
+
 // Consider: Why does it give this error? Is this what I predicted? If not, what's different?
+// let prediction = " because of the lack of slice method available for numbers,I predict that the code will throw an error. 
+// the cardNumber variable is a number, and slice is a method that can only be used on strings or arrays.";
+ //slice is a method that can only be used on strings or arrays." //
+
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+
+// The last4Digits variable should store the last 4 digits of cardNumber
+console.log(last4Digits); // "4213"

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

@@ -1,2 +1,5 @@
-const 12HourClockTime = "8:53pm";
-const 24hourClockTime = "20:53";
+const twelveHourClockTime = "8:53pm";
+ // the code having an error because the variable is not named correctly,has to be twelvehourclocktime instead of 12hourclocktime.
+const twentyFourHourClockTime = "20:53"; 
+// the code having an error because the variable is not named correctly,has to be twentyfourhourclocktime insted of 24hourclocktime.
+

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 +12,19 @@ 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
+//one function call in line 4 ,5 
 
 // 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?
+// there  seem to be no error when running the code.
 
 // c) Identify all the lines that are variable reassignment statements
+// line 4 and 5 
 
 // d) Identify all the lines that are variable declarations
+// 1,2,7,8
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+
+// The expression `Number(carPrice.replaceAll(",", ""))` is performs two operations. it uses the `replaceAll` method to remove all commas from the string `carPrice`, effectively converting it from a formatted string o a plain number string. 
+//Then, it converts that resulting string into a number using the `Number()` function. 
+//The purpose of this expression is to convert a formatted price string into a numerical value that can be used for calculations.    

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

@@ -7,19 +7,26 @@ const remainingMinutes = totalMinutes % 60;
 const totalHours = (totalMinutes - remainingMinutes) / 60;
 
 const result = `${totalHours}:${remainingMinutes}:${remainingSeconds}`;
-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 variables in total: movieLength, remainingSeconds, totalMinutes, remainingMinutes, totalHours, result  
 
 // b) How many function calls are there?
+// there are 3 function calls in line 4,7 and 9 
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // 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?
-
+// it means that the movie hour  is being calculated. totalminutes minus remainingseconds divided by 60.
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
-
+// the variable result represents the total length of the movie in hours and minutes.
+//Better name is MOvieTime.
 // 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 because it is using the modulus operator to calculate the remaining seconds and is using division to calculate the total hours. 
+// The code will correctly handle any length of movie in seconds and convert it to the appropriate format.
+

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

@@ -24,4 +24,10 @@ console.log(`£${pounds}.${pence}`);
 // Try and describe the purpose / rationale behind each step
 
 // To begin, we can start with
-// 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 1. const penceString = "399p": // the "399p"represents the amount in pence.
+// initializes a string variable with the value "399p"
+// 2. const penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1): // the trailing 'p'has been removed  from the string to isolate the numeric value.
+// 3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"): // ensures that the numeric value has at least three digits by padding with leading zeros .
+// 4. const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2): // extracts the pounds portion of the string by taking all but the last two characters.
+// 5. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0"): // extracts the pence portion of the string by taking the last two characters and ensures it has two digits by padding with trailing zeros .
+// 6. console.log(`£${pounds}.${pence}`): // outputs the final formatted price in pounds and pence to the console, prefixed with the pound symbol (£).

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?
+the browser stops running javascript at that point and awaits you to click the OK popup.
 
 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?
+`prompt`() gives back the value depending on what the user does.
 What is the return value of `prompt`?
+`prompt` returns a string containing what they typed.if they dint type anything it returns empty ("") and if they cancelled it returns null.

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

@@ -5,12 +5,18 @@ 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 { log: f, erro: f, warn: f,...}
 
 Try also entering `typeof console`
 
 Answer the following questions:
 
 What does `console` store?
+console stores an object provided by the browser that contains logging tools.
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+
+dot operator means acessing somthing inside an object.
+console is an object while log is a function inside that object