Fix truncated explanation in to-pounds step-by-step breakdown

Author: Pretty Taruvinga

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

@@ -1,21 +1,30 @@
 const penceString = "399p";
+// This line declares a constant variable named `penceString` and assigns it the value "399p".
+// This string represents a price in pence.
 
 const penceStringWithoutTrailingP = penceString.substring(
   0,
   penceString.length - 1
 );
+// This removes the trailing "p" from the string, leaving only the numeric value.
 
 const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+// Ensures the number has at least 3 digits by adding leading zeros if necessary.
+
 const pounds = paddedPenceNumberString.substring(
   0,
   paddedPenceNumberString.length - 2
 );
+// Extracts the pounds part of the value.
 
 const pence = paddedPenceNumberString
   .substring(paddedPenceNumberString.length - 2)
   .padEnd(2, "0");
+// Extracts the last two digits to represent the pence value.
 
 console.log(`£${pounds}.${pence}`);
+// This line constructs a string in the format "£X.XX" where X represents the pounds and pence values, and then prints it to the console.
+// Prints the formatted price such as "£3.99".
 
 // This program takes a string representing a price in pence
 // It then removes the trailing "p" character, pads the number with leading
@@ -24,7 +33,7 @@ console.log(`£${pounds}.${pence}`);
 // The program then builds up a string representing the price in pounds
 // and pence format (e.g., "£3.99") by concatenating the pounds and pence parts together with a "£" symbol and a decimal point. The final output is printed to the console.
 
-// This program takes a string representing a price in pence (e.g., "399p") and converts it into a formatted string representing the price in pounds and pence (e.g., "£3.99"). 
+// This program takes a string representing a price in pence (e.g., "399p") and converts it into a formatted string representing the price in pounds and pence (e.g., "£3.99").
 // by concatenating the pounds and pence parts together with a "£" symbol and a decimal point. The final output is printed to the console.
 
 // You need to do a step-by-step breakdown of each line in this program
@@ -33,21 +42,31 @@ console.log(`£${pounds}.${pence}`);
 // 2. penceStringWithoutTrailingP.padStart(3, "0") - line 5
 // 3. paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2) - line 6
 // 4. paddedPenceNumberString.substring(paddedPenceNumberString.length - 2) - line 9
-// 5. .padEnd(2, "0") - line 9
-// 6. console.log(`£${pounds}.${pence}`)' - line 11
+// 5. padEnd(2, "0") - line 9
+// 6. console.log(`£${pounds}.${pence}`) - line 11
 
 // Try and describe the purpose / rationale behind each step
 // 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?
 // c) Identify all the lines that are variable reassignment statements
 // d) Identify all the lines that are variable declarations
 // e) Describe what the expression penceString.substring(0, penceString.length - 1) is doing - what is the purpose of this expression?
 
-// To begin, we can start with
-// a) How many function calls are there in this file? Write down all the lines where a function call is made
+// a) How many function calls are there in this file?
 
-// 1. penceString.substring(0, penceString.length - 1) - line 3
-// 1. const penceString = "399p": initialises a string variable with the val
-// ue "399p".
-// 2. const penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1): creates a new string variable by taking a substring of `penceString` that excludes the last character (the "p"). This effectively removes the trailing "p" from the original string, leaving just the numeric part (e.g., "399").
-// 3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"): pads the `penceStringWithoutTrailingP` with leading zeros to ensure it has at least 3 characters. If `penceStringWithoutTrailingP` is shorter than 3 characters, it will add zeros at the start until it reaches a length of 3 (e.g., "399" remains "399", but "99" would become "099").
-// 4. const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length -
+// 1. penceString.substring(0, penceString.length - 1)
+// Removes the trailing "p" from `penceString` by taking a substring that excludes the last character.
+
+// 2. penceStringWithoutTrailingP.padStart(3, "0")
+// Ensures the string has at least 3 digits by adding leading zeros if needed.
+
+// 3. paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2)
+// Extracts the pounds part by taking all digits except the last two.
+
+// 4. paddedPenceNumberString.substring(paddedPenceNumberString.length - 2)
+// Extracts the last two digits to represent the pence value.
+
+// 5. padEnd(2, "0")
+// Ensures the pence value always has two digits by adding trailing zeros if necessary.
+
+// 6. console.log(`£${pounds}.${pence}`)
+// Prints the final formatted price in pounds and pence to the console.