parisminton · December 14, 2012 01:16 · Dec 14, 2012
diff --git a/convertToOrdinal.js b/convertToOrdinal.js
@@ -0,0 +1,63 @@
+function convertToOrdinal (i, zero_based) {
+  var number = zero_based ? ((i - 0) + 1) : (i - 0), // bootleg coercion
+      one = /\d+1$/,
+      two = /\d+2$/,
+      three = /\d+3$/,
+      zero_and_four_through_nine = /\d+[0456789]$/;
+
+  // For whatever goofy reason, typeof NaN == 'number'
+  if (typeof number == 'number' && !isNaN(number)) {
+    if (number == 0) {
+      console.log('Error: Argument cannot be zero - Zero can\'t be converted to a ranking.');
+    }
+    else if (number == 1) {
+      return 'first';
+    }
+    else if (number > 1 && number < 10) {
+      if (number == 2) {
+        return 'second';
+      }
+      if (number == 3) {
+        return 'third';
+      }
+      if (number == 4) {
+        return 'fourth';
+      }
+      if (number == 5) {
+        return 'fifth';
+      }
+      if (number == 6) {
+        return 'sixth';
+      }
+      if (number == 7) {
+        return 'seventh';
+      }
+      if (number == 8) {
+        return 'eighth';
+      }
+      if (number == 9) {
+        return 'ninth';
+      }
+    }
+    else if (number >= 10 && number < 20) {
+      return number + 'th';
+    }
+    else {
+      if (one.test(number)) {
+        return number + 'st';
+      }
+      if (two.test(number)) {
+        return number + 'nd';
+      }
+      if (three.test(number)) {
+        return number + 'rd';
+      }
+      if (zero_and_four_through_nine.test(number)) {
+        return number + 'th';
+      }
+    }
+  }
+  else {
+    console.log('Error: Argument is not a number or cannot be converted to a number.');
+  }
+}