Sprint 1 - Step 3 mandatory interpret's all 3 tasks are done

Author: Dagim-Daniel

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 +12,27 @@ 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 5 function calls in this file. including methods used , 2 methods  = replaceAll(), methods are called under their object, replaceAll() is called under the string object.
+    // The lines where a function call is made are:
+    // Line 4: carPrice.replaceAll(",", "")
+    // Line 5: priceAfterOneYear.replaceAll(",", "")
+    // Line 7: console.log(`The percentage change is ${percentageChange}`)
 
 // 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, - 
+    //the error is occurring because of a missing "," in the replaceAll() method. in line 5.
 
 // c) Identify all the lines that are variable reassignment statements
+    // The lines that are variable reassignment statements are:
+    // Line 4: carPrice = Number(carPrice.replaceAll(",", ""));
+    // Line 5: priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
 
 // d) Identify all the lines that are variable declarations
+    // The lines that are variable declarations are:
+    // 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?
+    // The expression Number(carPrice.replaceAll(",","")) is converting the string value of carPrice into a number by removing the comma from the string.

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

@@ -12,14 +12,23 @@ 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?
+    // there is 1 function call in this program, which is the console.log().
 
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
+    // The expression movieLength % 60 represents the remainder of the division of movieLength by 60. 
+    // In this case, it calculates the number of seconds remaining after converting the total movie length from seconds to minutes.
+    //  The modulo operator (%) returns the remainder of a division operation, so it helps to determine how many seconds are left after accounting for full minutes in the movie length.
+    // this means 8784 seconds is exactly 146 minutes and 24 seconds.
 
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
+    // The expression assigned to totalMinutes will return the total number of minutes only leaving the seconds out.
 
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
+    // the variable holds the hour,minutes and seconds a movie is long, so i prefer to name it movieDuration.
 
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+    // yes, this code will work for all values of movieLength because every attributes of the movieLength variable is being calculated and converted to hours, minutes and seconds.

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

@@ -3,17 +3,17 @@ const penceString = "399p";
 const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
-);
+);  // remove the trailing "p" from the string
 
-const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"); // pad the string with leading zeros to ensure it has at least 3 characters
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
-);
+); // get the substring representing the pounds by taking all characters except the last two
 
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
-  .padEnd(2, "0");
+  .padEnd(2, "0"); // get the substring representing the pence by taking the last two characters and padding it with a "0" if necessary
 
 console.log(`£${pounds}.${pence}`);
 
@@ -25,3 +25,8 @@ 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): removes the trailing "p" from the string to get the numeric part of the price in pence
+  //3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"): pads the string with leading zeros to ensure it has at least 3 characters, which is useful for prices less than £1
+  //4. const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2): extracts the substring representing the pounds by taking all characters/values except the last two
+  //5. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0"): extracts the substring representing the pence by taking the last two characters and padding it with a "0" if necessary
+  //6. console.log(`£${pounds}.${pence}`): outputs the final formatted price in pounds and pence to the console