3-mandatory-implement 3-to-pounds.js Implement toPound function to convert whole pence string to formatted pounds

Author: AlanGit-debug2604

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

@@ -4,3 +4,32 @@
 // 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 name toPound
+//identifier of prev code :
+// 1 penceString - user input ; Type: String, count length by .length
+// 2 penceStringWithoutTrailingP ; cut the tail p by .substring ()
+// 3 paddedPenceNumberString ; assign and prescribe target length of pence in three characters length by .padStart()
+// 4 pounds ; assign pounds from first character of paddedPenceNumberString, cut the last two character by .substring
+// 5 pence ; assign pence starting from last two character of paddedPenceNumberString
+// Parameter to name penceStringWithP
+
+function toPound(wholePenceStringWithP) {
+  const penceStringWithoutTrailingP = wholePenceStringWithP.substring(
+    0,
+    wholePenceStringWithP.length - 1,
+  );
+
+  const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+  const pounds = paddedPenceNumberString.substring(
+    0,
+    paddedPenceNumberString.length - 2,
+  );
+
+  const pence = paddedPenceNumberString.substring(
+    paddedPenceNumberString.length - 2,
+  );
+
+  return `£${pounds}.${pence}`;
+}
+console.log(toPound("399p"));