README.md

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Buffer Data Type Enumeration Constant

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

Usage

import dtypeEnum from 'https://cdn.jsdelivr.net/gh/stdlib-js/ndarray-base-buffer-dtype-enum@deno/mod.js';

dtypeEnum( buffer )

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

import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@deno/mod.js';
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

import dtypes from 'https://cdn.jsdelivr.net/gh/stdlib-js/ndarray-dtypes@deno/mod.js';
import bufferCtors from 'https://cdn.jsdelivr.net/gh/stdlib-js/ndarray-base-buffer-ctors@deno/mod.js';
import isFunction from 'https://cdn.jsdelivr.net/gh/stdlib-js/assert-is-function@deno/mod.js';
import dtypeEnum from 'https://cdn.jsdelivr.net/gh/stdlib-js/ndarray-base-buffer-dtype-enum@deno/mod.js';

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 );

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Notice

This package is part of stdlib, a standard library 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

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.