Glasgow_Class|Shreef_Ibrahim|Structuring _Testing _Datast|Week1_exercise1-update

Sprint-1/errors/0.js

@@ -1,2 +1,6 @@
-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?
+*/
+
+// To include instructions or comments in code for human readers without executing them.

Sprint-1/errors/1.js

@@ -1,4 +1,6 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+/* The value of a constant cannot change through re-assignment,
+we can use var or let insted*/
+let  age = 33;
 age = age + 1;

Sprint-1/errors/2.js

@@ -1,5 +1,14 @@
 // Currently trying to print the string "I was born in Bolton" but it isn't working...
 // what's the error ?
+/*
+ we try to print the value of variable `cityOfBirth` before declaring it.
+ JavaScript throws a reference error because the variable `cityOfBirth` has not been
+ defined at that point.*/
 
-console.log(`I was born in ${cityOfBirth}`);
-const cityOfBirth = "Bolton";
+ console.log(`I was born in ${cityOfBirth}`);
+ const cityOfBirth = "Bolton";
+
+ // correct version
+ // const cityOfBirth = "Bolton";
+ // console.log(`I was born in ${cityOfBirth}`);
+

Sprint-1/errors/3.js

@@ -1,9 +1,15 @@
 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
+
+/*because slice() is method of String not a Number.
+ It extracts a section of a string and returns 
+it as a new string, without modifying the original string.
+*/
+console.log(last4Digits) // expected output 4213

Sprint-1/errors/4.js

@@ -1,2 +1,7 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+// const 12HourClockTime = "20:53";
+// const 24hourClockTime = "08:53";
+/*
+Variable names must begin with a letter, 
+underscore, non-number character. Each language has its own conventions.*/
+const HourClockTime12 = "08:53";
+const hourClockTime24 = "20:53";

Sprint-1/exercises/count.js

@@ -1,6 +1,8 @@
 let count = 0;
 
-count = count + 1;
+ count++;
 
 // 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
+
+// eassigning the count variable to a new value by adding 1 to its current value.

Sprint-1/exercises/decimal.js

@@ -7,3 +7,11 @@ const num = 56.5678;
 // Create a variable called roundedNum and assign to it an expression that evaluates to 57 ( num rounded to the nearest whole number )
 
 // Log your variables to the console to check your answers
+let  wholeNumberPart = Math.floor(num);
+
+var decimalPart = (num - Math.floor(num)).toFixed(4);
+
+var roundedNum = Math.round(num);
+console.log(`Whole Number Part: ${wholeNumberPart}`); // Expected: 56
+console.log(`Decimal Part: ${decimalPart}`);          // Expected: 0.5678
+console.log(`Rounded Number: ${roundedNum}`);         // Expected: 57

Sprint-1/exercises/initials.js

@@ -4,3 +4,6 @@ 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.
+var initials = firstName[0] + middleName[0] + lastName[0];
+console.log(initials); 
+

Sprint-1/exercises/paths.js

@@ -11,8 +11,14 @@
 
 const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
 const lastSlashIndex = filePath.lastIndexOf("/");
+const lastDotIndex = filePath.lastIndexOf(".");
 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
 // Create a variable to store the ext part of the variable
+
+var dir = filePath.slice(0, lastSlashIndex);
+var ext = filePath.slice(lastDotIndex);
+console.log(dir)
+console.log(ext)

Sprint-1/exercises/random.js

@@ -2,8 +2,14 @@ const minimum = 1;
 const maximum = 100;
 
 const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
-
 // 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
 // Try logging the value of num and running the program several times to build an idea of what the program is doing
+
+     // The variable num represents a random integer between 1 and 100.
+    //  so each time you run the program, a different integer within the range [1, 100] will be generate.
+5.66;
+console.log(num);
+let x = Math.floor(Math.random()*(3 + 5 + 1))-5
+console.log(x);

Sprint-1/interpret/percentage-change.js

@@ -2,21 +2,26 @@ 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
+// There are five function calls in the file.
 
 // 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 in  line 6, the replace call function takes tow prameter there is no comma,to fix  you should add a comma between the arguments
 
 // c) Identify all the lines that are variable reassignment statements
+//  line 4 and 6
 
 // d) Identify all the lines that are variable declarations
+//  line 1, 2, 8 and 9
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+//    firsly its will remove the comma and convert the result to a number /the purpose is to get a number insted of str

Sprint-1/interpret/time-format.js

@@ -1,24 +1,30 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = 999999; // length of movie in seconds
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
+console.log("the total" + totalMinutes);
 
 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
+// For the piece of code above, read the ode and then answer the following questions
 
 // a) How many variable declarations are there in this program?
+//  6 variabls
 
 // b) How many function calls are there?
-
+//    1
 // c) Using documentation, explain what the expression movieLength % 60 represents
+//   The remainder (%) operator returns the remainder left over when one operand is divided by a second operand. It always takes the sign of the dividend.fb
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+//  calculate the total minutes by subtracting remainingSeconds from movieLength and then dividing by 60 to convert the remaining seconds into minutes
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// its using tamplat to store variable and any tex /the better name could be movieRuntime
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+//   yes will work/but with negative numbers gives unexpected resultscls

Sprint-1/interpret/to-pounds.js

@@ -10,6 +10,7 @@ const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
 );
+3;
 
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
@@ -25,3 +26,16 @@ 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);
+//    The substring() method her returns the part of this string from the start index up to lenght-1 => last one not inclouded then
+//    initialises a string variable  assign to the  result of supStr.
+// 3.const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+//   initialises a string variable with value of the result of padStart this case it will
+//   retun the value of three index form the started of Str =>399.
+// 4.const pounds = paddedPenceNumberString.substring( 0,paddedPenceNumberString.length - 2);
+//  samilar to 2 just in this case last to index not inclouded
+// 5.const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0");
+// this will finsh i 4 steps A/initialises a string variable/B- git the value (paddedPenceNumberString.length - 2 == 1)and  take us arg
+//  C/ calc paddedPenceNumberString.substring(1)=="99"  and the resultof padEnd() = 99 asign tp the pence
+// 5.console.log(£${pounds}.${pence});
+// This line outputs the formatted price in pounds and pence using template literals.