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Buffer Data Type Enumeration Constant

Return the data type enumeration constant of an ndarray data buffer.

Installation

npm install @stdlib/ndarray-base-buffer-dtype-enum

Alternatively,

To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
If you are using Deno, visit the deno branch (see README for usage intructions).
For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).

The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

Usage

var dtypeEnum = require( '@stdlib/ndarray-base-buffer-dtype-enum' );

dtypeEnum( buffer )

Returns the data type enumeration constant of an ndarray data buffer.

var Float64Array = require( '@stdlib/array-float64' );
var buf = new Float64Array( 10 );

var c = dtypeEnum( buf );
// returns <number>

If provided an ndarray data buffer having an unknown or unsupported data type, the function returns null.

var c = dtypeEnum( 'beep' );
// returns null

Notes

The principle use case for this function is JavaScript-C interoperability. In C, dtypes are assigned integer enumeration constants, not string values.

Examples

var dtypes = require( '@stdlib/ndarray-dtypes' );
var bufferCtors = require( '@stdlib/ndarray-base-buffer-ctors' );
var isFunction = require( '@stdlib/assert-is-function' );
var dtypeEnum = require( '@stdlib/ndarray-base-buffer-dtype-enum' );

var DTYPES;
var ctor;
var buf;
var len;
var c;
var i;

// Get a list of supported ndarray buffer data types:
DTYPES = dtypes();

// Buffer length:
len = 10;

// For each supported data type, create a buffer and retrieve its data type enumeration constant...
for ( i = 0; i < DTYPES.length; i++ ) {
    ctor = bufferCtors( DTYPES[ i ] );
    if ( DTYPES[ i ] === 'binary' && isFunction( ctor.alloc ) ) {
        buf = ctor.alloc( len );
    } else {
        buf = new ctor( len );
    }
    c = dtypeEnum( buf );
    console.log( '%s => %d', DTYPES[ i ], c );
}

// Try an array-like object...
buf = {
    'length': 10
};
c = dtypeEnum( buf );
console.log( '%s => %s', 'generic', c );

Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

Community

License

See LICENSE.

stdlib-js/ndarray-base-buffer-dtype-enum