London_ITP_Jan2025| Aung_Ye_Kyaw |Module-Structuring-Testing-Data |Coursework/sprint 1

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

@@ -2,5 +2,8 @@ let count = 0;
 
 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
+// Ans : Line 3 is adding 1 to the variable. = is assigning variable value.

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

@@ -5,7 +5,14 @@ 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 = ``;
+// declaring variables for each name and take out fist character
+
+let fname_initials = `${firstName.charAt(0)}`;
+let midname_initials = `${middleName.charAt(0)}`;
+let lastname_initials= `${lastName.charAt(0)}`;
+
+console.log("The letters are ",fname_initials,midname_initials,lastname_initials);
+
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
 

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

@@ -9,15 +9,18 @@
 
 // (All spaces in the "" line should be ignored. They are purely for formatting.)
 
-const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
+const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.jpeg";
 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
 
-const dir = ;
-const ext = ;
+const dir = filePath.slice(0,lastSlashIndex);
+console.log (`The dir part of the file path ${dir}`);
+const ext = filePath.slice(lastDotIndex+1);
+console.log(`The ext part of file path ${ext}`);
 
 // https://www.google.com/search?q=slice+mdn

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

@@ -3,6 +3,22 @@ const maximum = 100;
 
 const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 
+
+const step1 = Math.random();  // get random number >=0 & <1
+console.log(`The random number is ${step1}`);
+
+const step2 = (maximum-minimum+1);
+console.log(`The second step is ${step2}`); // subsctract (max from min) and add 1
+
+const step3 = step1*step2;  // random number multiply by the result from step2
+console.log(`The third step is ${step3}`);
+
+const step4 = Math.floor(step3);    // round down the number and return largest or equal to given number
+console.log (`The fourth step is ${step4}`);
+
+const step5 = step4 + minimum    //add with the minimun number 
+console.log (`The final step is ${step5}`);
+
 // 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

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

@@ -1,2 +1,5 @@
-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?
+
+//Ans: comment the 2 lines
+

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

@@ -2,3 +2,5 @@
 
 const age = 33;
 age = age + 1;
+
+// The error is cause of trying to change the constant variable 

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

@@ -3,3 +3,5 @@
 
 console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+
+// The error is because of accessing the variable (cityOfBirth) before declaration .

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

@@ -1,6 +1,10 @@
-const cardNumber = 4533787178994213;
+const cardNumber = "4533787178994213";  // adding double code to solve the error
 const last4Digits = cardNumber.slice(-4);
 
+console.log(`The last 4 digits are ${last4Digits}`);
+
+// The error is cause of function call on the wrong object (integer)
+
 // 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

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

@@ -1,2 +1,5 @@
 const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const 24hourClockTime = "08:53";
+
+// the error is because of variable naming conversion . The variable names are staring with numbers.
+// it should start with letter or underscore or dollar sign. 

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 +12,16 @@ 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
+        // 2 functions calls are there . Line 7 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?
+        //Error at Line 5. There are is cause of missing (,) in replace method . It can be fixed by putting (,) between arguments  at replace method() 
 
 // c) Identify all the lines that are variable reassignment statements
+        // Line 4 & 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?
+         // Removing the (,) in carPrice string and changing to number in order to get number value. 

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

@@ -1,4 +1,4 @@
-const movieLength = 8784; // length of movie in seconds
+const movieLength = 100784; // length of movie in seconds
 
 const remainingSeconds = movieLength % 60;
 const totalMinutes = (movieLength - remainingSeconds) / 60;
@@ -12,14 +12,18 @@ 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?
-
+        // 5
 // b) How many function calls are there?
-
+        //no function calls
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+    // getting the remainder
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+        // substract remaining minutes from total minuts and divided by 60
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+        // duration will be better 
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+        // yes it is working with different values. 

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

@@ -5,12 +5,15 @@ const penceStringWithoutTrailingP = penceString.substring(
   penceString.length - 1
 );
 
+
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
 );
 
+console.log (`The result is ${paddedPenceNumberString}`);
+
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
   .padEnd(2, "0");
@@ -25,3 +28,7 @@ console.log(`£${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) : removing p by using substring method.
+// 3.const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"); : adding 0 to the start from the left side in case of penstring have 2 numbers only 
+// 4. const pounds = paddedPenceNumberString.substring(0,paddedPenceNumberString.length - 2); : getting the first letter from the string 
+// 5. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0"); // get the last two letter and add zero in case if there is only one letter. 

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

@@ -11,8 +11,12 @@ In the Chrome console,
 invoke the function `alert` with an input string of `"Hello world!"`;
 
 What effect does calling the `alert` function have?
+pop up dialog box with the message "Hello World" and Ok button. 
 
 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?
+  pop up dialog box with text box to accept user input 
+
 What is the return value of `prompt`?
+ string is the return value of prompt

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

@@ -5,12 +5,17 @@ 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?
+// 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`
 
 Answer the following questions:
 
 What does `console` store?
+store data for a while 
+
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+// (.) is for accessing the object's method

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

@@ -1,13 +1,22 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> capitalise the first letter and take out as it from second till end .
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
 
+
 function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return str;
+  let name = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return name;
 }
 
+const Fname = capitalise("sarawone");
+console.log(`The result is ${Fname}`);
+
 // =============> write your explanation here
-// =============> write your new code here
+   // Ans: the error is cause of assigning the same variable in again in the function  (str)
+// =============> 
+// function capitalise(str) {
+  //let name = `${str[0].toUpperCase()}${str.slice(1)}`;
+  // return name;
+//}

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

@@ -1,20 +1,28 @@
 // Predict and explain first...
+// Will get syntax error 
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============> Cause same variable (decimalNumber) is reassign in the function body
 
 // Try playing computer with the example to work out what is going on
 
 function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
+  //const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
 
   return percentage;
 }
-
-console.log(decimalNumber);
+let number = convertToPercentage(0.5);
+console.log(`The result is ${number}`);
 
 // =============> write your explanation here
 
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+// =============> 
+  //function convertToPercentage(decimalNumber) 
+  // {
+  //const percentage = `${decimalNumber * 100}%`;
+  //return percentage;
+//}
+//let number = convertToPercentage(0.5);
+// console.log(`The result is ${number}`);

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

@@ -3,18 +3,26 @@
 
 // this function should square any number but instead we're going to get an error
 
-// =============> write your prediction of the error here
+// =============> there is no assign value for num variable
 
-function square(3) {
+function square(num) {
     return num * num;
 }
 
-// =============> write the error message here
+let result = square(3);
+console.log (`The result is ${result}`);
 
-// =============> explain this error message here
+// =============> SyntaxError: Unexpected number
+
+// =============> This error cause because there was a number in the place where it is not expected by parser.
 
 // Finally, correct the code to fix the problem
 
-// =============> write your new code here
+// =============> function square(num) {
+    // return num * num;
+    //  }
+
+// let result = square(3);
+// console.log (`The result is ${result}`);
 
 

Sprint-2/2-mandatory-debug/0.js

@@ -1,14 +1,19 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> no return in function so it will show error
 
 function multiply(a, b) {
   console.log(a * b);
+  return a*b;
 }
 
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
-// =============> write your explanation here
+// =============> it shows as undefined
 
 // Finally, correct the code to fix the problem
-//  =============> write your new code here
+//  =============> function multiply(a, b) {
+  //console.log(a * b);
+  //return a*b;
+// } 
+

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

@@ -1,13 +1,14 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> I think it will return the input parameter numbers 
 
 function sum(a, b) {
-  return;
-  a + b;
+  return a+b;
 }
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
-// =============> write your explanation here
+// =============> it returned undefined , there is not return value assign in the function body.
 // Finally, correct the code to fix the problem
-//  =============> write your new code here
+//  =============> function sum(a, b) {
+ // return a+b;
+// }

Sprint-2/2-mandatory-debug/2.js

@@ -1,11 +1,11 @@
 // Predict and explain first...
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============> I think it will return only 3 for every input .
 
-const num = 103;
+//const num = 103;
 
-function getLastDigit() {
+function getLastDigit(num) {
   return num.toString().slice(-1);
 }
 
@@ -14,11 +14,13 @@ console.log(`The last digit of 105 is ${getLastDigit(105)}`);
 console.log(`The last digit of 806 is ${getLastDigit(806)}`);
 
 // Now run the code and compare the output to your prediction
-// =============> write the output here
+// =============> 3
 // Explain why the output is the way it is
-// =============> write your explanation here
+// =============> The function do not take any parameter and it is taking the constant variable return the last digit.
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+// =============> function getLastDigit(num) {
+  //return num.toString().slice(-1);
+// }
 
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem