1 files changed, 15 insertions, 0 deletions
diff --git a/src/utils-common.ts b/src/utils-common.ts
index 8053043..153bbaa 100644
--- a/src/utils-common.ts
+++ b/src/utils-common.ts
@@ -33,3 +33,18 @@ export async function getUserIconUrl(userId: number): Promise<string> {
 
 	return (userpicture as HTMLImageElement).src ?? "";
 }
+
+// SplitMix32 implementation taken from:
+// https://github.com/bryc/code/blob/master/jshash/PRNGs.md
+// We only need a seeded PRNG to choose students to observe.
+export function splitmix32(a: number) {
+	return function () {
+		a |= 0;
+		a = (a + 0x9e3779b9) | 0;
+		let t = a ^ (a >>> 16);
+		t = Math.imul(t, 0x21f0aaad);
+		t = t ^ (t >>> 15);
+		t = Math.imul(t, 0x735a2d97);
+		return ((t = t ^ (t >>> 15)) >>> 0) / 4294967296;
+	};
+}