1 files changed, 21 insertions, 0 deletions
diff --git a/src/lib/custom-animations/util.ts b/src/lib/custom-animations/util.ts
new file mode 100644
index 000000000..0aebab57b
--- /dev/null
+++ b/src/lib/custom-animations/util.ts
@@ -0,0 +1,21 @@
+// It should roll when:
+// - We're going from 1 to 0 (roll backwards)
+// - The count is anywhere between 1 and 999
+// - The count is going up and is a multiple of 100
+// - The count is going down and is 1 less than a multiple of 100
+export function decideShouldRoll(isSet: boolean, count: number) {
+  let shouldRoll = false
+  if (!isSet && count === 0) {
+    shouldRoll = true
+  } else if (count > 0 && count < 1000) {
+    shouldRoll = true
+  } else if (count > 0) {
+    const mod = count % 100
+    if (isSet && mod === 0) {
+      shouldRoll = true
+    } else if (!isSet && mod === 99) {
+      shouldRoll = true
+    }
+  }
+  return shouldRoll
+}