Glasgow| 25-ITP-Sep | Abraham-Habte| Sprint 1 | Coursework/Sprint 1

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
+
+// Answer
+
+// Line 3; when we the right side first count in the right side is considerd as 0 so 0+1 will be 1.
+// But the = sign does not mean the mathimatical equal, its function is to take the result on the right and store it on the left.
+// Therfore if we write the same code in next line the result is not one but 2

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

@@ -17,7 +17,9 @@ 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 lastDotIndex = base.lastIndexOf(".");
+const ext = base.slice(lastDotIndex + 1);
+
 
 // https://www.google.com/search?q=slice+mdn

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

@@ -7,3 +7,22 @@ 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
+
+// Answer
+
+// 1. 
+// The num in this scenario represent any integer between 1 and 100
+
+// 2.
+// Math.floor: rounds the number down to the nearest whole number which means it ignores the number to the right of the point. eg. 4.7=4
+// Math.random is a js code that returns any random number that is greater than or equal to 0 and less than 1
+//* is multiplication
+// maximum is the maximum given number, in this case 100
+//- is a subtraction
+// minimum is the minimum given number, in this case 1
+//(maximum - minimum +1) this is subtracting the minimum number from the maximum and add 1, in this case (100-1+1)=100
+//+ minimum: this turns the value by adding 1 to the whole equation. 
+
+//3.
+
+console.log(num)

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 +1,5 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+let age = 33;
 age = age + 1;
+console.log(age)

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

@@ -1,5 +1,6 @@
 // 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

@@ -7,3 +7,13 @@ 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
+
+//Answer
+
+// This code is not working because slice() is working with "string" or "arrays" but not with numbers. and cardNumber is a number.
+// So the error is "TypeError:cardNumber.slice is not a function"\
+// slice() didn't recognize the number as I expected before.
+
+const cardNumber = 4533787178994213;
+const last4Digits = String(cardNumber).slice(-4);
+console.log(last4Digits)

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

@@ -1,2 +1,7 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+//const 12HourClockTime = "20:53";
+//const 24hourClockTime = "08:53";
+// in Javascript variable name can't start with a number. 
+const hourClockTime12 = "20:53";
+const hourClockTime24 = "08:53";
+console.log(hourClockTime12)
+console.log(hourClockTime24)

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

@@ -13,10 +13,37 @@ console.log(`The percentage change is ${percentageChange}`);
 
 // a) How many function calls are there in this file? Write down all the lines where a function call is made
 
+// There are five functions calls.
+//carPrice.replaceAll(",", "")
+//Number(carPrice.replaceAll(",", ""))
+//priceAfterOneYear.replaceAll("," "")
+//Number(priceAfterOneYear.replaceAll("," ""))
+//console.log(`The percentage change is ${percentageChange}`)
+
 // 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?
 
+// When I run the code the error is "syntaxError: missing ) after argument list.
+// The error comes from line 5
+// The error occurs due to the missing coma between the two strings in the replaceAll() call.
+// Add coma between the two strings "priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",", ""));"
+
 // c) Identify all the lines that are variable reassignment statements
 
+// there are to lines that state variable reassignment
+// carPrice = Number(carPrice.replaceAll(",", ""));
+// priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+
 // d) Identify all the lines that are variable declarations
 
+// There are fore variable declarations (line 1, line 2, line 7, line 8)
+// let carPrice = "10,000";
+// let priceAfterOneYear = "8,543";
+// const priceDifference = carPrice - priceAfterOneYear;
+// const percentageChange = (priceDifference / carPrice) * 100;
+
+
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+
+// carprice at line 1 is a string in order to calculate for the next line of codes you have to change the string ti number.
+// carPrice.replaceAll(",","")). delete the coma in between the number (e.g from "10,000" to "10000")
+// number() change the string to number ("10000" to 10000)

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

@@ -12,14 +12,21 @@ 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?
+// There are 6 variable declaration. "line1, line3, line4, line6, line7, line9"
 
 // b) How many function calls are there?
+// There is only one function call in this program "console.log(result);"
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+// % is called remainder. There fore movieLength % 60 represents the remainder of the movie length after dividing by 60.
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+// totalMinutes are calculated by subtracting the remaining seconds from movie length and divided by 60 to get full minutes. this helps to get a number which divided by 60 with out reminder.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// result represents the total length of the movie in the form of Hour: minute: second
+// moveDurationFormatted can be a better name to replace result. 
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// Yes it works for all value. the only thing that is concerning is the validation of movieLength as the negative integer also gives value which is unrealistic. 

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

@@ -25,3 +25,13 @@ 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 = penceString.substring( 0, penceString.length - 1);
+//    This remove the p and left the string with only 399
+// 3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+//    this code make sure that the string has 3 character. since one pound is equal 100 pence.
+// 4. const pounds = paddedPenceNumberString.substring( 0, paddedPenceNumberString.length - 2);
+//    This code takes the number leaving the last 2 digits  "in this case it takes 3 and leave 99"
+// 5. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2)  .padEnd(2, "0");
+//    This code takes the last digit from the string and also make sure that it has only two digits this gives a "99" value.
+// 6. console.log(`£${pounds}.${pence}`);
+//    This gives a result with £ sign and separated by . " in this case it gives £3.99 "

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

@@ -11,6 +11,7 @@ In the Chrome console,
 invoke the function `alert` with an input string of `"Hello world!"`;
 
 What effect does calling the `alert` function have?
+. It gives "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`.
 

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

@@ -6,11 +6,25 @@ Open the Chrome devtools Console, type in `console.log` and then hit enter
 
 What output do you get?
 
+. ƒ log() { [native code] }
+
+
 Now enter just `console` in the Console, what output do you get back?
 
+. console {debug: ƒ, error: ƒ, info: ƒ, log: ƒ, warn: ƒ, …}
+
 Try also entering `typeof console`
 
+. 'object'
+
 Answer the following questions:
 
 What does `console` store?
+he console stores logs messages, errors and wornning , user input/output, variables and objects, and results of expressions you run.
+
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+
+console is a built in object
+console.log means Accessing the log on the built in object which is the console
+console.assert means Access the assert method on the console object
+'.' it is an operator which is used to access a property or method of an object.