# Enumeration Constants
> Return an object mapping supported [data type][@stdlib/ndarray/dtypes] strings to enumeration constants.
## Usage
```javascript
var dtypeEnums = require( '@stdlib/ndarray/base/dtype-enums' );
```
#### dtypeEnums()
Returns an object mapping supported [data type][@stdlib/ndarray/dtypes] strings to enumeration constants.
```javascript
var out = dtypeEnums();
// {...}
```
## Notes
- Downstream consumers of a returned mapping should **not** rely on specific integer values (e.g., `int8 == 0`). Instead, the object should be used in an opaque manner.
- The main purpose of this function is JavaScript and C inter-operation of ndarray objects.
## Examples
```javascript
var dtypeStrings = require( '@stdlib/ndarray/base/dtype-strings' );
var dtypeEnums = require( '@stdlib/ndarray/base/dtype-enums' );
var dt = dtypeStrings();
// returns [...]
var enums = dtypeEnums();
// returns {...}
var i;
for ( i = 0; i < dt.length; i++ ) {
console.log( '%s => %d', dt[ i ], enums[ dt[ i ] ] );
}
```
[@stdlib/ndarray/dtypes]: https://github.com/stdlib-js/ndarray/tree/main/dtypes