feat(and): add and function

Author: djcsdy

index.test.ts

@@ -1,5 +1,6 @@
 import test from "ava";
 import {
+    and,
     asyncIterable,
     average,
     contains,
@@ -270,3 +271,9 @@ test("average", async t => {
     t.is(await average(asyncIterable([1, 2, 3, 2])), 2);
     t.is(await average(asyncIterable([])), null);
 });
+
+test("and", async t => {
+    t.true(await and(asyncIterable([true, true, true])));
+    t.false(await and(asyncIterable([true, false, true])));
+    t.true(await and(asyncIterable([])));
+});

index.ts

@@ -847,3 +847,9 @@ export async function average(iterable: AsyncIterableLike<number>): Promise<numb
 }
 
 export const asyncAverage = average;
+
+export async function and(iterable: AsyncIterableLike<boolean>): Promise<boolean> {
+    return (await findIndex(iterable, element => !element)) == null;
+}
+
+export const asyncAnd = and;