Add containsWhitespace snippet

snippets/containsWhitespace.md

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+---
+title: containsWhitespace
+tags: string,regexp,beginner
+---
+
+Returns `true` if the given string contains any whitespace characters, `false` otherwise.
+
+Use `RegExp.prototype.test()` with an appropriate regular expression to check if the given string contains any whitespace characters.
+
+```js
+const containsWhitespace = str => /\s/.test(str);
+```
+
+```js
+containsWhitespace('lorem'); // false
+containsWhitespace('lorem ipsum'); // true
+```

test/containsWhitespace.test.js

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+const {containsWhitespace} = require('./_30s.js');
+
+test('containsWhitespace is a Function', () => {
+  expect(containsWhitespace).toBeInstanceOf(Function);
+});
+test('containsWhitespace returns true when there are whitespaces', () => {
+  expect(containsWhitespace('Lorem Ipsum')).toBe(true);
+});
+test('containsWhitespace returns false when there are no whitespaces', () => {
+  expect(containsWhitespace('LoremIpsum')).toBe(false);
+});