Manchester | 26-ITP-May | Abdu Hassen | sprint 1 | Structuring and testing data

Sprint-1/1-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
+/* On line 3 it is reassigning the count variable with new variable by incrementing  the count by 1
+     = sign is used as assigning operator */

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

@@ -5,7 +5,6 @@ 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 = `${firstName.charAt(0)}${middleName.charAt(0)}${lastName.charAt(0)}`;
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
-

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

@@ -12,12 +12,13 @@
 const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
 const lastSlashIndex = filePath.lastIndexOf("/");
 const base = filePath.slice(lastSlashIndex + 1);
+const lastDotIndex = filePath.lastIndexOf(".");
 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(lastDotIndex + 1);
 
-// https://www.google.com/search?q=slice+mdn
+// https://www.google.com/search?q=slice+mdn

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

@@ -7,3 +7,9 @@ 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
+/*  -This function give us any random integer from 1 to 100,including 1 and 100
+     -Math.floor() is a built-in JavaScript function that rounds a number down to the nearest integer
+     -Math.random () is a built-in JavaScript function that generates random number greater than or equal to
+      0 and less than 1 
+    -first of all i will try to get a value [0, 1) from Math.random and multiple it by 100
+      and apply Math.floor to the result which will give me the integer number and then add the minimum value i.e. 1  */

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 +1,4 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+let age = 33;
 age = age + 1;

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

@@ -1,5 +1,4 @@
 // 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

@@ -1,9 +1,12 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const last4Digits = 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 code is not working because of the variable type which is .slice method work on 
+string and array variable types not on number variable types to fix it we can change the variable type to 
+string variable type by adding double quotation marks to the variable.*/

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

@@ -1,2 +1,3 @@
 const 12HourClockTime = "8:53pm";
 const 24hourClockTime = "20:53";
+/*when we give a name for variable(identifiers) we can not start with number or any special characters */

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 +12,17 @@ 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 call in this file it is on line 4,5 and 10.
 
 // 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 coming from line 5 and it is because it miss a comma between two argument.
 
 // c) Identify all the lines that are variable reassignment statements
+// Variables are reassigned in two lines and the lines are in line 4 and 5.
 
 // d) Identify all the lines that are variable declarations
+// Variables are declared in four different lines those lines are 1,2,7 and 8
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+/* In this expression there is two function call when we start from the inside we got that replaceAll which will do is
+   it replace a specific string patter with a given argument, the other one is Number which change the data type from string to number */

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

@@ -12,14 +12,27 @@ 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?
+// This program contains 6 variable declarations.
 
 // b) How many function calls are there?
+// There is only 1 function call in this program.
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+/* The expression represent that by dividing the movieLength with 60 returns the remainder and % represent 
+   operator returns the remainder after division */
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+/* The expression have two operation the first one is subtracting the remainingSecondes from the movieLength 
+   then dividing the result with 60 to get the minutes of the movie */
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// result represent the total movie length using hours,minutes and seconds,the better name can be movieRunTime.
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+/* The code converts a movie length given in seconds into hours, minutes, and seconds. It uses the remainder operator (%) to find 
+  the leftover seconds after dividing by 60. It then converts the remaining seconds into minutes and uses % 60 again to find the leftover minutes. 
+The remaining minutes are converted into hours. 
+
+    The code works correctly for positive whole numbers of seconds. However, it may not work as expected 
+for negative numbers, decimal values, or invalid inputs such as strings.*/

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

@@ -25,3 +25,17 @@ 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): on this statement the initialized value
+ is excluding the alphabet p from  the string by using string method that return only arguments that is mention using index */
+
+/* 3.const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"): on this statement it will
+ add number 0 in the front of the number in any situation if the given number less than 3 character until the length becomes 3 */
+
+/* 4.  const pounds = paddedPenceNumberString.substring(0,paddedPenceNumberString.length - 2): on this statement .substring method is used again 
+          it returns the portion of the string starting at the specified index and continuing to the end in case it remove the last two number characters  */
+
+/* 5.const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0"): he code first uses substring() to get 
+   the last two characters of paddedPenceNumberString. Then it uses padEnd(2, "0") to make sure the resulting string is at least 2 characters long by adding
+  zeros to the end if needed. Since substring() is called first, its result is passed to padEnd().    */
+
+/* 6.console.log(`£${pounds}.${pence}`): on this statement it will print the value of pound and pence together by using template literals */