util conf

src/class/Util.ts

@@ -169,4 +169,23 @@ export default class Util {
     }
     return string;
   }
+
+  public percentile(arr: number[], val: number) {
+    return (100 * arr.reduce((acc, v) => acc + (v < val ? 1 : 0) + (v === val ? 0.5 : 0), 0)) / arr.length;
+  }
+
+  public ordinal(i: number) {
+    const j = i % 10;
+    const k = i % 100;
+    if (j === 1 && k !== 11) {
+      return `${i}st`;
+    }
+    if (j === 2 && k !== 12) {
+      return `${i}nd`;
+    }
+    if (j === 3 && k !== 13) {
+      return `${i}rd`;
+    }
+    return `${i}th`;
+  }
 }