Check if only value is present in array.
npm install @extra-array/includes-onlyCheck if only value is present in [array].
``javascript
const includesOnly = require('@extra-array/includes-only');
// includesOnly(
// -> true|false
includesOnly(['a', 'b', 'b', 'c'], 'b');
// false (abbc !== bbbb)
includesOnly(['a', 'b', 'b', 'c'], 'b', 1);
// false (bbc !== bbb)
includesOnly(['a', 'b', 'b', 'c'], 'b', 1, 3);
// true (bb === bb)
`
> With [extra-array] try
[extra-array]: https://www.npmjs.com/package/extra-array
[array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Indexed_collections