add includesAll

snippets/includesAll.md

@@ -0,0 +1,17 @@
+---
+title: includesAll
+tags: array,beginner
+---
+
+Returns `true` if all the elements of values are included in arr , `false` otherwise.
+
+Use `Array.prototype.every()` and `Array.prototype.includes()` to check if all elements of `values` are included in `arr`.
+
+```js
+const includesAll = (arr, values) => values.every(v => arr.includes(v));
+```
+
+```js
+includesAll([1, 2, 3, 4], [1, 4]); // true
+includesAll([1, 2, 3, 4], [1, 5]); // false
+```

test/includesAll.test.js

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+const {includesAll} = require('./_30s.js');
+
+test('any is a Function', () => {
+  expect(includesAll).toBeInstanceOf(Function);
+});
+test('Returns true when all values are included in arr', () => {
+  expect(includesAll([0, 1, 2, 3], [0, 1])).toBe(true);
+});
+test('Returns false when one element fo values is not included in arr', () => {
+  expect(includesAll([0, 1, 2, 3], [1, 2, 4])).toBe(false);
+});
+test('Returns false when values is larger than arr', () => {
+  expect(includesAll([0, 1, 2], [0, 1, 2, 3])).toBe(false);
+});