NW6|Bakhat Begum|Module-JS1 |Bakha/week-3| Sprint-3|Week-3

week-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 ?

week-1/errors/1.js

@@ -1,4 +1,5 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
-age = age + 1;
+let age = 33;
+age += 1;
+console.log(age);

week-1/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 ?
+//ans : In JavaScrip/node.js the code executed from top to bottom, any variable must be declare before log it to console.
 
-console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);

week-1/errors/3.js

@@ -1,7 +1,10 @@
 const cardNumber = 4533787178994213;
-const last4Digits = cardNumber.slice(-4);
+const cardNumberAsString = cardNumber.toString()
+const last4Digits = cardNumberAsString.slice(-4);
 
+console.log(last4Digits);
 // The last4Digits variable should store the last 4 digits of cardNumber
 // However, the code isn't working
 // Make and explain a prediction about why the code won't work
+//ans: I think we use .slice method for string. According to me, .toFixed() method will work on card. The method .toFixed() is used for numerical values .
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value

week-1/errors/4.js

@@ -1,2 +1,5 @@
-const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const twelveHourClockTime = "20:53";
+const twentyOneHourClockTime = "08:53";
+console.log(twelveHourClockTime);
+console.log(twentyOneHourClockTime);
+// we can not initialize variable with numbers or with first capital letter. JavaScript is a case sensitive language.

week-1/exercises/count.js

@@ -2,5 +2,9 @@ let count = 0;
 
 count = count + 1;
 
+console.log(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
+//ans: line three is a statement which give instruction the computer to execute code. 
+

week-1/exercises/decimal.js

@@ -1,6 +1,13 @@
 
 const num = 56.5467;
+const wholeNumberPart = Math.trunc(num);
+console.log(wholeNumberPart );
 
+const decimalPart = (num - Math.floor(num)).toFixed(4);   // if we console.log the decimalPart = Math.floor(num);  output : 56, we subtract original number with result.
+console.log(decimalPart);
+
+const roundedNum = Math.round(num);
+console.log(roundedNum);
 // You should look up Math functions for this exercise https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math
 
 // Create a variable called wholeNumberPart and assign to it an expression that evaluates to 56 ( the whole number part of num )

week-1/exercises/initials.js

@@ -1,6 +1,15 @@
-let firstName = "Creola";
-let middleName = "Katherine";
-let lastName = "Johnson";
+let firstName = "creole";
+let middleName = "katherine";
+let lastName = "johnson";
+
+let initials = firstName.charAt(0).toUpperCase() + firstName.slice(1);
+let initialsTwo = middleName.charAt(0).toUpperCase() + middleName.slice(1);
+let initialsThree = lastName.charAt(0).toUpperCase() + lastName.slice(1);
+
+
+console.log(initials);
+console.log(initialsTwo);
+console.log(initialsThree);
 
 // Declare a variable called initials that stores the first character of each string in upper case to form the user's initials
 // Log the variable in each case

week-1/exercises/paths.js

@@ -11,8 +11,20 @@
 
 const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
 const lastSlashIndex = filePath.lastIndexOf("/");
-const base = filePath.slice(lastSlashIndex + 1);
+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
+
+const directory = filePath.slice(0, lastSlashIndex);
+console.log(`The base part of ${filePath} is ${directory}`);
+
+
 // Create a variable to store the ext part of the variable
+
+const extPath = base.lastIndexOf(".");
+const ext = extPath !== -1? base.slice(extPath + 1): "No extension";
+console.log(`The base part of ${filePath} is ${ext}`);
+
+
+

week-1/exercises/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 several times to build an idea of what the program is doing
+
+console.log(num);
+
+//ans : we declared variable minimum with vale 1, and maximum with 100. We have an other variable num with statement. 
+ //We use Meth.floor method to erase decimal point and Math.random method to take any number include 0 and exclusive 101.
+

week-1/explore/chrome.md

@@ -12,7 +12,16 @@ invoke the function `alert` with an input string of `"Hello world!"`;
 
 What effect does calling the `alert` function have?
 
+ans: I used function greeting(){
+alert("Hello World!")
+};
+greeting();
+
+To invoke mean to call or execute. So when i invoke function 'greeting', a message pops up on screen. It mean alert will appeared the message in screen.
+
 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?
+ans: It well pop up box of information for user to input some text.
 What is the return value of `prompt`?
+ans: What is your name? With textbox that user put there name..

week-1/explore/objects.md

@@ -5,12 +5,21 @@ 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?
+ans: undefine, which may be mean as it does not have value or variable.
 
 Now enter just `console` in the Console, what output do you get back?
 
+ans: The output that I get is debug and error.
+
 Try also entering `typeof console`
 
+ans: the out that i get is object.
+
 Answer the following questions:
 
 What does `console` store?
+ans; it might be store data.
 What does the syntax `console.log` or `console.assert` mean? In particular, what does the `.` mean?
+ans; console.log will record something that happens in our program and print out it in text based in a terminal.
+the console.assert writes an error message to console if the assertion is false. If the assertion is true nothing happens.
+`.` means brackets.

week-1/interpret/percentage-change.js

@@ -13,8 +13,16 @@ 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
 
+//ans; 3 functions, line 4 , 5 and 10.
+
 // b) Identify all the lines that are variable reassignment statements
 
+//ans; there are 2 line 4, 5.  ` carPrice `, `priceAfterOneYear `.
+
 // c) Identify all the lines that are variable declarations
 
+//ans; line 1, 2, 7, 8
+
 // d) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+
+// ans; It will replace the value of carPrice. Which means it will bring the number without comma. 

week-1/interpret/time-format.js

@@ -15,15 +15,30 @@ console.log(result);
 
 // a) How many variable declarations are there in this program?
 
+//ans; Their is no variable declarations.
+
 // b) How many function calls are there?
 
+//ans; 1 function, console.log
+
 // c) Using documentation on MDN, explain what the expression movieLength % 60 represents
 
+//ans; the remainder of the division of movieLength by 60
+
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
 
+//ans; the total remainingSeconds is in integer.
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
 
-// f) Think about whether this program will work for all values of movieLength.
-//    Think of what values may cause problems for the code.
+//ans; the length of move in hours minutes and seconds. can be length.
+
+//ans; it will bring an output result of 2 : 26: 24
+
+// f) Think about whether this program will work for all values of movieLength.  
+//ans ; yes
+//    Think of what values may cause problems for the code. 
+// ans; infinity
 //    Decide the result should be for those values, then test it out.
+// ans; the results undefine
 //    Can you find any values of movieLength which don't give you what you'd expect?
+//ans; no

week-1/interpret/to-pounds.js

@@ -15,15 +15,23 @@ const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
   .padEnd(2, "0");
 
+
+
 console.log(`£${pounds}.${pence}`);
 
 // This program takes a string representing a price in pence
 // The program then builds up a string representing the price in pounds
 
 // You need to do a step-by-step breakdown of each line in this program
 // Try and describe the purpose / rationale behind each step
+
 // You should use MDN to look up substring, padStart and padEnd to interpret this program
 
 // 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"
+//ans:
+// 3-6: extract a substring of the string '399p' that starts from index 0 and has a length of 'penceString.length - 1' (3) which gives '399'
+// 8. if previous answer has length less than 3, add string '0' to reach given length of 3 - not applicable here.
+// 9-12: for previous answer (399), start from index 0, string must of length 'paddedPenceNumberString.length - 2' = 1. Ans = 3
+//14-16: here index starts from 1 '.substring(paddedPenceNumberString.length - 2)' and continue to last index from 'a.padEnd(2, "0");'. so starting from index 1 and going to las index gives 99

week-2/debug/0.js

@@ -1,4 +1,19 @@
 // Predict and explain first...
+//Ans: The code defines a function called multiply that takes two parameters a and b.
+
+//Inside the function, it simply prints out the result of multiplying a and b using console.log(a * b).
+
+// After defining the function, the code calls the multiply function, passing 10 and 32 as the arguments.
+
+// The results of the function call are inserted into a template literal `The result of multiplying 10 and 32 is ${multiply(10, 32)}`
+
+// So when this line runs, it will call the multiply function, multiplying 10 and 32.
+
+// The multiply function will print out 320.
+
+// Then that 320 result gets inserted into the template literal, which prints out the full string:
+
+// "The result of multiplying 10 and 32 is 320"
 
 function multiply(a, b) {
   console.log(a * b);

week-2/debug/1.js

@@ -1,8 +1,33 @@
 // Predict and explain first...
+//Ans: The code defines a function called sum that takes two parameters a and b.
+
+//Inside the function, it simply prints out the result of adding a and b using return a * b.
+
+// After defining the function, the code calls the sum function, passing 10 and 32 as the arguments.
+
+// The results of the function call are inserted into a template literal `The result of adding 10 and 32 is ${multiply(10, 32)}`
+
+// So when this line runs, it will call the sum function, adding 10 and 32.
+
+// The sum function will not print out 42. So when you call sum(10, 32), the function executes return; which 
+
+// exits the function immediately without returning any value.
+
+// Hence, since the function doesn't return anything explicitly, the returned value is undefined.
+
+// Here is a correct code.
+//function sum(a, b) {
+//   return a + b;
+// }
 
 function sum(a, b) {
   return;
-  a + b;
+a + b;
 }
 
+
+// Here is a correct code.
+function sum(a, b) {
+  return a + b;
+}
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);

week-2/debug/2.js

@@ -1,14 +1,29 @@
 // Predict and explain first...
+// Ans: the code define num variable with value 0f 103. We have function called getLastDigit. 
+//Inside the function, it simply prints out the result of last digit using  return num.toString().slice(-1).
+//After defining the function, the code calls the getLastDigit() function, passing 42, 105 and 806 as the arguments.
+//The results of the function call are inserted into a template literal 
+//`The last digit of 42 is ${getLastDigit(42)}`); output: 3
+//`The last digit of 105 is ${getLastDigit(105)}`); output: 3
+//`The last digit of 806 is ${getLastDigit(806)}`); output: 3
 
-const num = 103;
 
-function getLastDigit() {
+const numOne = 42;
+const numTwo = 105;
+const numThree = 806;
+
+function getLastDigit(num) {
   return num.toString().slice(-1);
 }
 
-console.log(`The last digit of 42 is ${getLastDigit(42)}`);
-console.log(`The last digit of 105 is ${getLastDigit(105)}`);
-console.log(`The last digit of 806 is ${getLastDigit(806)}`);
+console.log(`The last digit of 42 is ${getLastDigit(numOne, 42)}`);
+console.log(`The last digit of 105 is ${getLastDigit(numTwo, 105)}`);
+console.log(`The last digit of 806 is ${getLastDigit(numThree, 806)}`);
 
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem
+//Ans: The key issue is that getLastDigit() function doesn't accept any parameters. It always just returns the last digit of the num variable defined outside the function.
+// So when you call getLastDigit(42), the 42 is ignored.
+// Inside getLastDigit(), it converts the num variable (which is 103) to a string, takes the last character (3) and returns that.
+// It has no way to access the 42 value passed to it.
+// To fix it, you need to update the function to accept a parameter.

week-2/errors/0.js

@@ -1,9 +1,27 @@
 // Predict and explain first...
+//Ans: You're absolutely right! Calling the capitalize function as shown would result in a SyntaxError.
+//The key reason is that the capitalize function has not been defined anywhere before calling it.
+//In JavaScript, you have to first declare/define a function before you can call it.
+
 // write down the error you predict will be raised
-// then call the function capitalise with a string input
+//ans ; syntaxError.
+// then call the function capitalize with a string input
 // interpret the error message and figure out why it's happening, if your prediction was wrong
+//ans;  My prediction was right about syntaxError..
+
+function capitalize(text) {
+  let str = `${text[0].toUpperCase()}${text.slice(1)}`;
+  return str;
+}
+let text = "i like ice-cream";
+console.log(capitalize(text));
+
+
 
-function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+//here is the correct
+function capitalize(text) {
+  let str = `${text[0].toUpperCase()}${text.slice(1)}`;
   return str;
 }
+let text1 = "i like ice-cream";
+console.log(capitalize(text));

week-2/errors/1.js

@@ -1,13 +1,20 @@
 // Predict and explain first...
+
+//ans ; we declared const decimalNumber inside the body function it mean it is Local scope, which never allow variable to call out side the function.
+// as a result we face syntexError.
 // Write down the error you predict will be raised
+//ans; syntaxError
 // Why will an error occur when this program runs?
+//ans: Variable Scope: If the variable is defined within the function using the var, let, or const keyword, it is only accessible within that function's scope.
 // Play computer with the example to work out what is going on
 
 function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
 
   return percentage;
 }
+console.log(convertToPercentage(0.5));
 
-console.log(decimalNumber);
+// here is the second solution
+// const decimalNumber = 0.5;
+// console.log(convertToPercentage(decimalNumber));