A reusable function created from previous sprint.

Author: russom

Sprint-2/3-mandatory-implement/3-to-pounds.js

@@ -4,3 +4,47 @@
 // You will need to declare a function called toPounds with an appropriately named parameter.
 
 // You should call this function a number of times to check it works for different inputs
+
+function toPounds(penceString) {
+  const penceStringWithoutTrailingP = penceString.substring(
+    // p is removed from the string with the sub string method.
+    0,
+    penceString.length - 1
+    // length - 1 is used to get the index of the last character in penceString, which is p.
+  );
+
+  const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+  // padStart is used to ensure that the string has at least 3 characters by adding 0 at the start of the string 
+  // if it is less than 3 characters long. This is important for formatting purposes, 
+  // as we want to ensure that we have at least 3 digits to represent pounds and pence.
+  const pounds = paddedPenceNumberString.substring(
+    0,
+    paddedPenceNumberString.length - 2
+    // substring is used to extract the pounds portion of the string by taking all characters except the last two, 
+    // which represent pence.
+  );
+
+  const pence = paddedPenceNumberString
+    .substring(paddedPenceNumberString.length - 2)
+    .padEnd(2, "0");
+    // substring is used to extract the pence portion of the string by taking the last two characters.
+    // padEnd is used to ensure that the pence portion has at least 2 characters by adding 0 at the end of the string 
+    // if it is less than 2 characters long. This is important for formatting purposes, 
+    // as we want to ensure that we have at least 2 digits to represent pence.
+  return `£${pounds}.${pence}`;
+  // finally, the function returns a string representing the price in pounds, 
+  // formatted with a £ symbol and a decimal point separating pounds and pence.
+}
+console.log(toPounds("399p"));
+console.log(toPounds("1p"));
+console.log(toPounds("3999p"));
+// above are some test cases to check if the function works correctly for different inputs. 
+
+// 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
+
+// To begin, we can start with
+// 1. const penceString = "399p": initialises a string variable with the value "399p"