algorithm: remove index from bisect

src/algorithm/index.ts

@@ -29,22 +29,19 @@ export async function autoBisect(
     end: number,
     check: (
         begin: number,
-        end: number,
-        index: number
+        end: number
     ) => Promise<boolean>) {
 
     // Try to find the first index where check() predicates to true.
     // Assume check() is true at first, for range [begin, end)
-    let index = 0;
     while (end - begin > 1) {
         const mid = Math.floor((end - begin) / 2) + begin;
-        if (await check(begin, mid, index)) {
+        if (await check(begin, mid)) {
             // Shrink half range.
             end = mid;
         } else {
             begin = mid;
         }
-        index++;
     }
 
     return begin;