@stdlib/ndarray-base-buffer-dtype-enum
v0.2.2
Published
Return the data type enumeration constant of an ndarray data buffer.
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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
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.
Copyright
Copyright © 2016-2024. The Stdlib Authors.