time-to-botec/squiggle/node_modules/@stdlib/assert/has-arrow-function-support/README.md

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# Arrow Function Support

> Detect native [`arrow function`][mdn-arrow-function] support.

<section class="usage">

## Usage

```javascript
var hasArrowFunctionSupport = require( '@stdlib/assert/has-arrow-function-support' );
```

#### hasArrowFunctionSupport()

Detects if a runtime environment supports ES2015 [`arrow functions`][mdn-arrow-function]` such as `( a, b ) => a + b`, `x => x`, or `( x ) => { return x*x; }`.

```javascript
var bool = hasArrowFunctionSupport();
// returns <boolean>
```

</section>

<!-- /.usage -->

<section class="notes">

## Notes

-   The implementation uses code evaluation, which may be problematic in browser contexts enforcing a strict [content security policy][mdn-csp] (CSP).

</section>

<!-- /.notes -->

<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var hasArrowFunctionSupport = require( '@stdlib/assert/has-arrow-function-support' );

var bool = hasArrowFunctionSupport();
if ( bool ) {
    console.log( 'Environment has native arrow function support.' );
} else {
    console.log( 'Environment lacks native arrow function support.' );
}
```

</section>

<!-- /.examples -->

* * *

<section class="cli">

## CLI

<section class="usage">

### Usage

```text
Usage: has-arrow-function-support [options]

Options:

  -h,    --help                Print this message.
  -V,    --version             Print the package version.
```

</section>

<!-- /.usage -->

<section class="examples">

### Examples

```bash
$ has-arrow-function-support
<boolean>
```

</section>

<!-- /.examples -->

</section>

<!-- /.cli -->

<section class="links">

[mdn-arrow-function]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions

[mdn-csp]: https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP

</section>

<!-- /.links -->