add nova

nova/resources/js/util/increaseOrDecrease.js

@@ -0,0 +1,11 @@
+export default function increaseOrDecrease(currentValue, startingValue) {
+  if (startingValue === 0) {
+    return null
+  }
+
+  if (currentValue > startingValue) {
+    return ((currentValue - startingValue) / Math.abs(startingValue)) * 100
+  } else {
+    return ((startingValue - currentValue) / Math.abs(startingValue)) * -100
+  }
+}