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* @license Apache-2.0
*
* Copyright (c) 2020 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 isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
var MAX = require( '@stdlib/constants/array/max-typed-array-length' );
// VARIABLES //
var MAX_LENGTH = MAX / 2; // every complex array element has both a real and imaginary component stored as separate numbers, so the maximum length is half that of a normal typed array
// MAIN //
/**
* Tests if a value is complex-typed-array-like.
*
* @param {*} value - value to test
* @returns {boolean} boolean indicating if a value is complex-typed-array-like
*
* @example
* var arr = {
* 'BYTES_PER_ELEMENT': 8,
* 'length': 10,
* 'byteOffset': 0,
* 'byteLength': 10,
* 'get': function get() {},
* 'set': function set() {}
* };
* var val = isComplexTypedArrayLike( arr );
* // returns true
*
* @example
* var Complex64Array = require( '@stdlib/array/complex64' );
*
* var val = isComplexTypedArrayLike( new Complex64Array( 4 ) );
* // returns true
*
* @example
* var val = isComplexTypedArrayLike( [] );
* // returns false
*
* @example
* var val = isComplexTypedArrayLike( {} );
* // returns false
*
* @example
* var val = isComplexTypedArrayLike( null );
* // returns false
*
* @example
* var val = isComplexTypedArrayLike( 'beep' );
* // returns false
*/
function isComplexTypedArrayLike( value ) {
return (
value !== null &&
typeof value === 'object' &&
// Check for standard typed array properties:
isNonNegativeInteger( value.length ) &&
value.length <= MAX_LENGTH &&
typeof value.BYTES_PER_ELEMENT === 'number' &&
typeof value.byteOffset === 'number' &&
typeof value.byteLength === 'number' &&
// Check for properties necessary for complex typed arrays:
typeof value.get === 'function' &&
typeof value.set === 'function'
);
}
// EXPORTS //
module.exports = isComplexTypedArrayLike;
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