feat(std/bytes): add hasSuffix and contains functions, update docs (#4801)

1 files changed, 20 insertions, 0 deletions

diff --git a/std/bytes/test.ts b/std/bytes/test.ts
index 13ac7a1fd..8b03de926 100644
--- a/std/bytes/test.ts
+++ b/std/bytes/test.ts
@@ -5,8 +5,10 @@ import {
   findLastIndex,
   equal,
   hasPrefix,
+  hasSuffix,
   repeat,
   concat,
+  contains,
 } from "./mod.ts";
 import { assertEquals, assertThrows, assert } from "../testing/asserts.ts";
 import { encode, decode } from "../encoding/utf8.ts";
@@ -24,6 +26,11 @@ Deno.test("[bytes] findIndex2", () => {
   assertEquals(i, 1);
 });
 
+Deno.test("[bytes] findIndex3", () => {
+  const i = findIndex(encode("Deno"), encode("D"));
+  assertEquals(i, 0);
+});
+
 Deno.test("[bytes] findLastIndex1", () => {
   const i = findLastIndex(
     new Uint8Array([0, 1, 2, 0, 1, 2, 0, 1, 3]),
@@ -47,6 +54,11 @@ Deno.test("[bytes] hasPrefix", () => {
   assertEquals(v, true);
 });
 
+Deno.test("[bytes] hasSuffix", () => {
+  const v = hasSuffix(new Uint8Array([0, 1, 2]), new Uint8Array([1, 2]));
+  assertEquals(v, true);
+});
+
 Deno.test("[bytes] repeat", () => {
   // input / output / count / error message
   const repeatTestCase = [
@@ -97,3 +109,11 @@ Deno.test("[bytes] concat empty arrays", () => {
   assert(u1 !== joined);
   assert(u2 !== joined);
 });
+
+Deno.test("[bytes] contain", () => {
+  const source = encode("deno.land");
+  const pattern = encode("deno");
+  assert(contains(source, pattern));
+
+  assert(contains(new Uint8Array([0, 1, 2, 3]), new Uint8Array([2, 3])));
+});