added comments to the function getOrdinalNumber

Author: Grajales-K

Sprint-3/revise/implement/get-ordinal-number.js

@@ -0,0 +1,24 @@
+// get-ordinal-number.js
+function getOrdinalNumber(num) {
+  // Check if the input is a number and an integer
+  if (typeof num !== "number" || !Number.isInteger(num)) {
+    throw new Error("Input must be an integer."); // Throw an error if input is not an integer
+  }
+
+  // Array of suffixes for ordinal numbers
+  const suffixes = ["th", "st", "nd", "rd"];
+  
+  // Get the last two digits of the number
+  const v = num % 100;
+
+  // Special case handling for 11th, 12th, and 13th
+  if (v >= 11 && v <= 13) {
+    return num + "th"; // Always use "th" for these cases
+  }
+
+  // Use the suffix based on the last digit
+  return num + (suffixes[num % 10] || "th"); // Default to "th" if no specific suffix is found
+}
+
+module.exports = getOrdinalNumber; // Export the function
+