# Constants
> Half-precision floating-point mathematical constants.
## Usage
```javascript
var constants = require( '@stdlib/constants/complex64' );
```
#### constants
Half-precision floating-point mathematical constants.
```javascript
var c = constants;
// returns {...}
```
- [`NUM_BYTES`][@stdlib/constants/complex64/num-bytes]: size (in bytes) of a 64-bit complex number.
## Examples
```javascript
var objectKeys = require( '@stdlib/utils/keys' );
var constants = require( '@stdlib/constants/complex64' );
console.log( objectKeys( constants ) );
```
[@stdlib/constants/complex64/num-bytes]: https://www.npmjs.com/package/@stdlib/constants/tree/main/complex64/num-bytes