Update

Author: russom

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

@@ -0,0 +1,48 @@
+const penceString = "399p";
+
+const penceStringWithoutTrailingP = penceString.substring(
+  0,
+  penceString.length - 1,
+);
+
+const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+const pounds = paddedPenceNumberString.substring(
+  0,
+  paddedPenceNumberString.length - 2,
+);
+
+const pence = paddedPenceNumberString.substring(
+  paddedPenceNumberString.length - 2,
+);
+
+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
+
+// To begin, we can start with
+// 1. const penceString = "399p": initialises a string variable with the value "399p"
+
+// Answers
+
+// 2. const penceStringWithoutTrailingP = penceString.substring(0, penceString.length - 1):
+//    the substring() method returns the characters starting at index 0(3) up to and excluding the end(9) of penString variable.
+//    This way only 399 is extracted of the string. Then the result is assigned to penceStringWithoutTrailingP variable.
+
+// 3. const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0"):
+//    The method padStart(3, "0") adds the string 0 before if the length of penceStringWithoutTrailingP string is less than 3 characters.
+//    It then assign it to paddedPenceNumberString variable. For example if the string is 11, it returns 011 or the string is 1, it returns 001.
+
+// 4. const pounds = paddedPenceNumberString.substring(0, paddedPenceNumberString.length - 2)
+//    Again the method substring() returns the characters starting at length 0 and removing the last two characters which are the pence(00).
+//    This gives us only the pounds value and it the assigned to the pounds variable.
+
+// 5. const pence = paddedPenceNumberString.substring(paddedPenceNumberString.length - 2).padEnd(2, "0"):
+//    substring method first returns the last two characters of the paddedPenceNumberString string.
+//    Then the padEnd() method adds a 0 if the length of the string is less than 2. Then it assigns it to pence variable.
+
+// 6. console.log(`£${pounds}.${pence}`):
+//    Finally console.log prints the pounds and pence adding the the pound sign £ first using template literal as £3.99