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* @license Apache-2.0
*
* Copyright (c) 2026 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var isNumber = require( '@stdlib/assert/is-number' ).isPrimitive;
var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
var isComplexLike = require( '@stdlib/assert/is-complex-like' );
var complexDType = require( '@stdlib/complex/dtype' );
var defaults = require( '@stdlib/ndarray/defaults' );
// VARIABLES //
var DEFAULT_REAL = defaults.get( 'dtypes.real_floating_point' );
var DEFAULT_CMPLX = defaults.get( 'dtypes.complex_floating_point' );
var DEFAULT_BOOL = defaults.get( 'dtypes.boolean' );
// MAIN //
/**
* Returns the default ndarray data type for a given scalar value.
*
* ## Notes
*
* - If the `value`
*
* - is a number, returns the default real-valued floating-point data type.
* - is a boolean, returns the default boolean data type.
* - is a complex number object of a known complex data type, returns the data type.
* - is a complex number object of an unknown complex data type, returns the default complex-valued floating-point data type.
* - is any other value type, returns `'generic'`.
*
* @param {*} value - input scalar
* @returns {string} ndarray data type
*
* @example
* var dt = scalarDType( 3.14 );
* // returns 'float64'
*
* @example
* var dt = scalarDType( true );
* // returns 'bool'
*
* @example
* var dt = scalarDType( 'hello' );
* // returns 'generic'
*/
function scalarDType( value ) {
var dt;
if ( isNumber( value ) ) {
return DEFAULT_REAL;
}
if ( isBoolean( value ) ) {
return DEFAULT_BOOL;
}
if ( isComplexLike( value ) ) {
dt = complexDType( value );
return ( dt === null ) ? DEFAULT_CMPLX : dt;
}
return 'generic';
}
// EXPORTS //
module.exports = scalarDType;
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