sprint-1 exercies has been completed

Author: shreefAhmedM

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
+// is assignment it takes the variable vlue, which is 0 and add 1.
+// // Since count was initially 0, this becomes: count = 0 + 1, so count now holds the value 1.

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

@@ -6,7 +6,7 @@ let lastName = "Johnson";
 // 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.charAt(0)+middleName.charAt(0)+lastName.charAt(0)}`;
-console.log(typeof(initials)) //==> CKJ
+// console.log(initials) ==> CKJ
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
 

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

@@ -22,6 +22,5 @@ const dir = filePath.slice(0,lastSlashIndex)
 
 const lastDoutIndex = base.lastIndexOf(".")
 const ext = base.slice(lastDoutIndex)
-console.log(ext)
 
 // https://www.google.com/search?q=slice+mdn

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

@@ -1,7 +1,7 @@
 const minimum = 1;
 const maximum = 100;
 
-const num = Math.floor(0.999 * (maximum - minimum + 1)) + minimum;
+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

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

@@ -1,2 +1,4 @@
-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?
+// we could add a Single-line comment // .or  Multi-line comment /* */
+// Now JavaScript will ignore those lines, and they will not affect our program.

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

@@ -3,3 +3,4 @@
 // const age = 33;
 let age = 33;
 age = age + 1;
+

Sprint-1/3-mandatory-interpret/1-percentage-change.js

@@ -12,12 +12,21 @@ 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
-     // 3 functions in lines 4, 5 and 10
+//     5 functions in lines 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?
+//        SyntaxError: missing ) after argument list is  Missing comma between arguments
 
 // c) Identify all the lines that are variable reassignment statements
+//         Line 4 :carPrice = Number(carPrice.replaceAll(",", ""));
+//        Line 5:priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
 
 // d) Identify all the lines that are variable declarations
+//        Line 1: let carPrice = "10,000";
+//        Line 2: let priceAfterOneYear = "8,543";
+//        Line 7: const priceDifference = carPrice - priceAfterOneYear;
+//        Line 8: const percentageChange = (priceDifference / carPrice) * 100;
 
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+//    removes all commas from the string "10,000", making it "10000". and Number(...): converts the resulting string "10000" to a number type 10000.
+//    so the purpose is to  convert a comma-formatted string into a usable numeric value for mathematical operation.

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

@@ -11,15 +11,24 @@ 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?
+// a) How many variable declarations are there in this program
+//     6 variable declared
 
 // b) How many function calls are there?
+//   1 function in line 10
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
+//The remainder (%) operator returns the remainder
+// so is divide movieLength by 60 and return the remainder."
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+//First, it takes away the extra seconds that don't make up a full minute.
+// Then it divides the remaining seconds by 60 to figure out how many complete minutes are in the movie.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+// formattedTime
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// Yes  but not all  ,because It handles converting seconds into minutes and hours using integer division and modulus.But with negative  integers dose not work correcly
+//And does not pad single-digit values with zeroes as wll, It will return something like 2:4:7 instead of 02:04:07, which is not a standard time format.

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

@@ -25,3 +25,24 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+// Initializes a string that represents an amount in (pence), ending with a `"p"` to signify pence (e.g., `"399p"` = 399 pence).
+
+//2- const penceStringWithoutTrailingP = penceString.substring(0,penceString.length - 1);
+// this Removes the trailing "p" from the string.so it is substring(0, penceString.length - 1)
+// takes all characters except the last. for example For "399p", this returns "399".
+
+// 3-const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+// Pads the number with leading zeros to ensure it is at least 3 digits long. so it helps normalise values like "5" → "005" and "99" → "099".
+
+// 4  const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2);
+//  Extracts the pounds from the padded string.so it takes all digits except the last two.
+//For "399", this gives "3" → meaning 3 pounds.
+
+//5- const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0");
+// Extracts the last two digits for pence and pads them if necessary.
+// substring(length - 2) takes the final 2 characters.
+// padEnd(2, "0") ensures the pence string is exactly 2 digits. transfer to two-digit formatting for pence 5 => "05".
+
+//6-  console.log(`£${pounds}.${pence}`);
+//this log the final formatted string in pounds and pence using a template literal.
+// For "399p", output is: £3.99