Manchester | 26-ITP-Jan | Liban Jama | Sprint 1 | Structuring and Testing Data

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

@@ -4,3 +4,9 @@ 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
+
+// count is a variable
+
+// line 1 - count is declared as 0
+
+// line 3 - they are adding count + 1 to 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
 

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

@@ -16,8 +16,12 @@ 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  filePathArray = filePath.split("/");
+console.log("filePathArray", filePathArray);
+const lastDotIndex = filePath.lastIndexOf(".");
 
-const dir = ;
-const ext = ;
-
+const dir = filePathArray.slice(0,7).join("/");
+const ext = filePath.slice(lastDotIndex);
+console.log('dir', dir)
+console.log('ext', ext)
 // https://www.google.com/search?q=slice+mdn

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

@@ -7,3 +7,5 @@ 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
+
+// max 100 - min 1 = 99 + 1 = 100 

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

@@ -1,2 +1,4 @@
-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?
+
+//I put these two lines in a comment.

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

@@ -1,4 +1,6 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+let age = 33;
 age = age + 1;
+
+// I changed the const to let as const cannot be reassigned to a new value. 

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 showed error as const cannot be declared after console.log. I put the const before the console.log.

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

@@ -1,9 +1,13 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = cardNumber.toString().slice(-4);
+console.log(last4Digits);
+console.log(cardNumber.toString().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
+
+// The card number is a number whereas .slice only works using a string or arrays.

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

@@ -1,2 +1,4 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const twelveHourClockTime = "20:53";
+const twentyFourHourClockTime = "08:53";
+
+// i changed the variables so that they start with a letter and not a number as it was throwing an error.

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 +12,12 @@ 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
-
+// there are three function calls on lines 4, 5, and 8.
 // 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 needs to be a comma after the quotation marks to make it a correct Javascript syntax. 
 // 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, 6, and 7.
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// it is removing the commas so that it has a numeric value as opposed to a formatted string. This allows for calculations by making the string convertible to numbers. The replaceAll() removes all commas, and the Number() makes the result a numeric value.  

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

@@ -1,5 +1,5 @@
-const movieLength = 8784; // length of movie in seconds
-
+const movieLength = 44.69; // length of movie in seconds
+console.log("movieLength",movieLength)
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
 
@@ -12,14 +12,15 @@ 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 represents the amount of seconds left over after converting it into whole minutes.
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
-
+// It represents the total number of complete minutes in movieLength.
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
-
+// It represents the total running time of the movie in hours, minutes, and seconds. A better name for this variable could be movieDuration.
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// It works for most values except negative values and decimal values. This is because it only expects positive whole number inputs.

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

@@ -4,17 +4,18 @@ const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
 );
-
+console.log("penceStringWithoutTrailingP",penceStringWithoutTrailingP)
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+console.log("paddedPenceNumberString",paddedPenceNumberString)
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
 );
-
+console.log("pounds",pounds)
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
   .padEnd(2, "0");
-
+console.log("pence",pence)
 console.log(`£${pounds}.${pence}`);
 
 // This program takes a string representing a price in pence
@@ -25,3 +26,8 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 3-6. It makes a new string penceStringWithoutTrailingP containing all the characters of penceString except the last one which is the trailing character "P". It uses the substring() method by specifying the start and end indexes.
+// 8. It makes a new variable called paddedPenceNumberString, and then stores the result of calling padStart on the previous variable which is penceStringWithoutTrailingP. This adds zeros at the beginning of the string if its less than three characters. 
+// 10. It makes a new variable called pounds, it takes paddedPenceNumberString and removes the last two characters. So the value of  pounds is three.
+// 15. It makes a new variable called pence. It takes paddedPenceNumberString and takes the last two characters, if its less than two characters it will pad it with zeros until its two characters. So the result is 99.
+// 19. It console logs pounds and pence together as one string with a pound sign.

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

@@ -11,8 +11,9 @@ In the Chrome console,
 invoke the function `alert` with an input string of `"Hello world!"`;
 
 What effect does calling the `alert` function have?
-
+// It sends a pop up alert that 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?
 What is the return value of `prompt`?
+//It prompts the user the to input what I ask them. The return value is the user's name which they enter into the text field.

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

@@ -5,12 +5,14 @@ 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?
-
+// log() { [native code] } i get a function called log.
 Now enter just `console` in the Console, what output do you get back?
-
+I get an object called console which holds a bunch of functions.
 Try also entering `typeof console`
-
+'object'
 Answer the following questions:
 
-What does `console` store?
+What does `console` store? 
+It stores functions.
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+The '.' means let me access the property inside an object.