WM4 | Fatima Safana |Module 2/Sprint1 Exercises | Week4

Sprint-1/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/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/errors/2.js

@@ -1,5 +1,5 @@
 // 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/errors/3.js

@@ -1,9 +1,19 @@
-const cardNumber = 4533787178994213;
+const cardNumber = "4533787178994213";
 const last4Digits = cardNumber.slice(-4);
+console.log(last4Digits);
+
+function last4(num) {
+    return String(num.slice(-4));
+}
+
+console.log(last4("12237890"));
 
 // 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
+//Answers:
+/*The code should print out 4213, because .slice() is a string type function, thus 
+value needs to be "string" */

Sprint-1/errors/4.js

@@ -1,2 +1,3 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const twelveHourClockTime = "20:53";
+const twentyFourHourClockTime = "08:53";
+//variable names cannot start with numbers.

Sprint-1/exercises/count.js

@@ -4,3 +4,4 @@ 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
+// = is re-assigning the value of count to be count plus 1.

Sprint-1/exercises/decimal.js

@@ -7,3 +7,13 @@ 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.round(num);
+    console.log(wholeNumberPart)
+
+let decimalPart = (num - Math.floor(num)).toFixed(4);
+    console.log(decimalPart);
+
+let roundedNum = Math.round(num);
+     console.log(roundedNum);
+

Sprint-1/exercises/initials.js

@@ -4,3 +4,7 @@ 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 = firstName[0] + middleName[0] + lastName[0];
+
+console.log(initials);

Sprint-1/exercises/paths.js

@@ -11,8 +11,16 @@
 
 const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
 const lastSlashIndex = filePath.lastIndexOf("/");
+    console.log(lastSlashIndex);
 const base = filePath.slice(lastSlashIndex + 1);
+    console.log(base);
 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 dirPart = filePath.substring(45, -1);
+    console.log(`The directory path of ${dirPart}`);
+
+const extPart = dirPart + "ext.txt";
+    console.log(`The ext path is ${extPart}`);

Sprint-1/exercises/random.js

@@ -7,3 +7,7 @@ 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
+
+console.log(num);
+
+// The program creates a random whole number between 1 and 100, max and min inclusive.

Sprint-1/interpret/percentage-change.js

@@ -2,21 +2,28 @@ 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}`);
+console.log(carPrice)
 
 // 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 5 function calls. These are in line 4,5,10.
 
 // 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 was coming from line 5, there was no , between the two arguments.
 
 // c) Identify all the lines that are variable reassignment statements
+    // line 4 and 5.
 
 // d) Identify all the lines that are variable declarations
+    //line 1, 2, 7, 8
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+    //The purpose is to convert the string value to numerical value, so that it can be evaluated.
+    //The expression replaces , with nothing "" then converts to number.

Sprint-1/interpret/time-format.js

@@ -1,4 +1,4 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = 10000; // length of movie in seconds
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
@@ -12,13 +12,19 @@ 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 declarations in this program.
 
 // b) How many function calls are there?
+    //1
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
+    // The expression utilizes the modulus operator % which returns the value reminder after dividing the movielenght by 60
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+    //the expression calculate the total minutes by converting the remaining seconds to minutes.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+    // movie duration
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+    // This code will work for all values.

Sprint-1/interpret/to-pounds.js

@@ -4,16 +4,21 @@ const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
 );
+  console.log(penceStringWithoutTrailingP);
 
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+  console.log(paddedPenceNumberString);
+
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
 );
+  console.log(pounds);
 
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
   .padEnd(2, "0");
+  console.log(pence); 
 
 console.log(`£${pounds}.${pence}`);
 
@@ -24,4 +29,16 @@ 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": initializes a string variable with the value "399p"
+// 3. initializes a variable that removes the "p" at the end, it uses method .substring
+// which returns the part of the string corresponding to the index and end index
+//-1 excluding the p
+//9. uses the method padstart to add "0" to the start of string penceStringWithoutTrailingP,
+// it returns the same string unchanged because the target length is equal to the current length.
+// this effectively multiplies any value input as penceStringWithoutTrailingP by 100
+//12. uses the substring method to return the first value of the string, this is to get
+// the pound. it also used length -2 to make sure its in a valid range so the program
+// can go through the steps with any value input.
+//18.the code gets the last two digits from the paddedPenceNumberString and ensures that the result
+//is a two-digit string by padding it with 0.
+//23. Print the value of pounds and pence with a period in between using template literals.