is-4byte-code-point/README.md

Check if a given number is a code point of UTF-8 4-byte character

# is-4byte-code-point

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Check if a given number is a [code point](http://unicode.org/glossary/#code_point) of [UTF-8](https://tools.ietf.org/html/rfc3629) 4-byte character

```javascript
import is4byteCodePoint from 'is-4byte-code-point';

is4byteCodePoint('Ａ'.codePointAt(0)); //=> false
is4byteCodePoint('👍'.codePointAt(0)); //=> true
```

## Installation

#### [npm](https://www.npmjs.com/)

```
npm install is-4byte-code-point
```

#### [Bower](http://bower.io/)

```
bower install is-4byte-code-point
```

### is4byteCodePoint(*number*)

*number*: `Number`  
Return: `Boolean`

It returns `true` if the number is no fewer than `65536` and no greater than `1114111`, otherwise `false`.

```javascript
is4byteCodePoint(-1); //=> false
is4byteCodePoint(0); //=> false
is4byteCodePoint(100000); //=> true
is4byteCodePoint(1000000); //=> false
is4byteCodePoint(NaN); //=> false
is4byteCodePoint(Infinity); //=> false
```

## License

Copyright (c) 2016 [Shinnosuke Watanabe](https://github.com/shinnn)

Licensed under [the MIT License](./LICENSE).