diff --git a/packages/binary/src/count.ts b/packages/binary/src/count.ts
index 20f674d3c1..f511462da5 100644
--- a/packages/binary/src/count.ts
+++ b/packages/binary/src/count.ts
@@ -11,6 +11,26 @@ export const popCount: FnN = (x) => (
     (((x + (x >>> 4)) & 0xf0f0f0f) * 0x1010101) >>> 24
 );
 
+/**
+ * Returns number of set bits (1's) in the given array (index range).
+ *
+ * @param data -
+ * @param start -
+ * @param n -
+ */
+export const popCountArray = (
+    data: Uint32Array,
+    start = 0,
+    n = data.length
+) => {
+    let num = 0;
+    for (let end = start + n; start < end; start++) {
+        const x = data[start];
+        x > 0 && (num += popCount(x));
+    }
+    return num;
+};
+
 /**
  * Returns number of bit changes between `x` and `y`.
  *