feat: add support for accessor arrays

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Author: aayush0325

lib/node_modules/@stdlib/stats/base/nanmax/README.md

@@ -109,6 +109,7 @@ var v = nanmax.ndarray( 5, x, 2, 1 );
 ## Notes
 
 -   If `N <= 0`, both functions return `NaN`.
+-   Both functions support array-like objects having getter and setter accessors for array element access (e.g., [`@stdlib/array/base/accessor`][@stdlib/array/base/accessor]).
 -   Depending on the environment, the typed versions ([`dnanmax`][@stdlib/stats/base/dnanmax], [`snanmax`][@stdlib/stats/base/snanmax], etc.) are likely to be significantly more performant.
 
 </section>
@@ -170,6 +171,8 @@ console.log( v );
 
 [mdn-typed-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray
 
+[@stdlib/array/base/accessor]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/array/base/accessor
+
 <!-- <related-links> -->
 
 [@stdlib/stats/base/dnanmax]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/base/dnanmax

lib/node_modules/@stdlib/stats/base/nanmax/docs/types/index.d.ts

@@ -20,7 +20,12 @@
 
 /// <reference types="@stdlib/types"/>
 
-import { NumericArray } from '@stdlib/types/array';
+import { NumericArray, Collection, AccessorArrayLike } from '@stdlib/types/array';
+
+/**
+* Input array.
+*/
+type InputArray = NumericArray | Collection<number> | AccessorArrayLike<number>;
 
 /**
 * Interface describing `nanmax`.
@@ -40,7 +45,7 @@ interface Routine {
 	* var v = nanmax( x.length, x, 1 );
 	* // returns 2.0
 	*/
-	( N: number, x: NumericArray, strideX: number ): number;
+	( N: number, x: InputArray, strideX: number ): number;
 
 	/**
 	* Computes the maximum value of a strided array, ignoring `NaN` values and using alternative indexing semantics.
@@ -57,7 +62,7 @@ interface Routine {
 	* var v = nanmax.ndarray( x.length, x, 1, 0 );
 	* // returns 2.0
 	*/
-	ndarray( N: number, x: NumericArray, strideX: number, offsetX: number ): number;
+	ndarray( N: number, x: InputArray, strideX: number, offsetX: number ): number;
 }
 
 /**

lib/node_modules/@stdlib/stats/base/nanmax/docs/types/test.ts

@@ -16,6 +16,7 @@
 * limitations under the License.
 */
 
+import AccessorArray = require( '@stdlib/array/base/accessor' );
 import nanmax = require( './index' );
 
 
@@ -26,6 +27,7 @@ import nanmax = require( './index' );
 	const x = new Float64Array( 10 );
 
 	nanmax( x.length, x, 1 ); // $ExpectType number
+	nanmax( x.length, new AccessorArray( x ), 1 ); // $ExpectType number
 }
 
 // The compiler throws an error if the function is provided a first argument which is not a number...
@@ -85,6 +87,7 @@ import nanmax = require( './index' );
 	const x = new Float64Array( 10 );
 
 	nanmax.ndarray( x.length, x, 1, 0 ); // $ExpectType number
+	nanmax.ndarray( x.length, new AccessorArray( x ), 1, 0 ); // $ExpectType number
 }
 
 // The compiler throws an error if the `ndarray` method is provided a first argument which is not a number...

lib/node_modules/@stdlib/stats/base/nanmax/lib/accessors.js

@@ -0,0 +1,96 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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 isnan = require( '@stdlib/math/base/assert/is-nan' );
+var isPositiveZero = require( '@stdlib/math/base/assert/is-positive-zero' );
+
+
+// MAIN //
+
+/**
+* Computes the maximum value of a strided array, ignoring `NaN` values.
+*
+* @private
+* @param {PositiveInteger} N - number of indexed elements
+* @param {Object} x - input array object
+* @param {Collection} x.data - input array data
+* @param {Array<Function>} x.accessors - array element accessors
+* @param {integer} strideX - stride length
+* @param {NonNegativeInteger} offsetX - starting index
+* @returns {number} maximum value
+*
+* @example
+* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
+* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
+*
+* var x = toAccessorArray( [ 2.0, 1.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0, NaN, NaN ] );
+*
+* var v = nanmax( 5, arraylike2object( x ), 2, 1 );
+* // returns 4.0
+*/
+function nanmax( N, x, strideX, offsetX ) {
+	var xbuf;
+	var get;
+	var max;
+	var ix;
+	var v;
+	var i;
+
+	// Cache reference to array data:
+	xbuf = x.data;
+
+	// Cache a reference to the element accessor:
+	get = x.accessors[ 0 ];
+
+	if ( N === 1 || strideX === 0 ) {
+		return get( xbuf, offsetX );
+	}
+	ix = offsetX;
+	for ( i = 0; i < N; i++ ) {
+		v = get( xbuf, ix );
+		if ( v === v ) {
+			break;
+		}
+		ix += strideX;
+	}
+	if ( i === N ) {
+		return NaN;
+	}
+	max = v;
+	i += 1;
+	for ( i; i < N; i++ ) {
+		ix += strideX;
+		v = get( xbuf, ix );
+		if ( isnan( v ) ) {
+			continue;
+		}
+		if ( v > max || ( v === max && isPositiveZero( v ) ) ) {
+			max = v;
+		}
+	}
+	return max;
+}
+
+
+// EXPORTS //
+
+module.exports = nanmax;

lib/node_modules/@stdlib/stats/base/nanmax/lib/ndarray.js

@@ -22,6 +22,8 @@
 
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var isPositiveZero = require( '@stdlib/math/base/assert/is-positive-zero' );
+var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
+var accessors = require( './accessors.js' );
 
 
 // MAIN //
@@ -44,12 +46,17 @@ var isPositiveZero = require( '@stdlib/math/base/assert/is-positive-zero' );
 function nanmax( N, x, strideX, offsetX ) {
 	var max;
 	var ix;
+	var o;
 	var v;
 	var i;
 
 	if ( N <= 0 ) {
 		return NaN;
 	}
+	o = arraylike2object( x );
+	if ( o.accessorProtocol ) {
+		return accessors( N, o, strideX, offsetX );
+	}
 	if ( N === 1 || strideX === 0 ) {
 		return x[ offsetX ];
 	}

lib/node_modules/@stdlib/stats/base/nanmax/test/test.main.js

@@ -23,6 +23,7 @@
 var tape = require( 'tape' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var isPositiveZero = require( '@stdlib/math/base/assert/is-positive-zero' );
+var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
 var Float64Array = require( '@stdlib/array/float64' );
 var nanmax = require( './../lib/main.js' );
 
@@ -67,6 +68,33 @@ tape( 'the function calculates the maximum value of a strided array', function t
 	t.end();
 });
 
+tape( 'the function calculates the maximum value of a strided array (accessors)', function test( t ) {
+	var x;
+	var v;
+
+	x = [ 1.0, -2.0, -4.0, 5.0, 0.0, 3.0, NaN, NaN ];
+	v = nanmax( x.length, toAccessorArray( x ), 1 );
+	t.strictEqual( v, 5.0, 'returns expected value' );
+
+	x = [ -4.0, NaN, -5.0 ];
+	v = nanmax( x.length, toAccessorArray( x ), 1 );
+	t.strictEqual( v, -4.0, 'returns expected value' );
+
+	x = [ -0.0, NaN, 0.0, -0.0 ];
+	v = nanmax( x.length, toAccessorArray( x ), 1 );
+	t.strictEqual( isPositiveZero( v ), true, 'returns expected value' );
+
+	x = [ NaN ];
+	v = nanmax( x.length, toAccessorArray( x ), 1 );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	x = [ NaN, NaN ];
+	v = nanmax( x.length, toAccessorArray( x ), 1 );
+	t.strictEqual( isnan( v ), true, 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'if provided an `N` parameter less than or equal to `0`, the function returns `NaN`', function test( t ) {
 	var x;
 	var v;
@@ -94,6 +122,18 @@ tape( 'if provided an `N` parameter equal to `1`, the function returns the first
 	t.end();
 });
 
+tape( 'if provided an `N` parameter equal to `1`, the function returns the first element (accessors)', function test( t ) {
+	var x;
+	var v;
+
+	x = [ 1.0, -2.0, -4.0, 5.0, 3.0 ];
+
+	v = nanmax( 1, toAccessorArray( x ), 1 );
+	t.strictEqual( v, 1.0, 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'the function supports a `stride` parameter', function test( t ) {
 	var x;
 	var v;
@@ -117,6 +157,29 @@ tape( 'the function supports a `stride` parameter', function test( t ) {
 	t.end();
 });
 
+tape( 'the function supports a `stride` parameter (accessors)', function test( t ) {
+	var x;
+	var v;
+
+	x = [
+		1.0,  // 0
+		2.0,
+		2.0,  // 1
+		-7.0,
+		-2.0, // 2
+		3.0,
+		4.0,  // 3
+		2.0,
+		NaN,  // 4
+		NaN
+	];
+
+	v = nanmax( 5, toAccessorArray( x ), 2 );
+
+	t.strictEqual( v, 4.0, 'returns expected value' );
+	t.end();
+});
+
 tape( 'the function supports a negative `stride` parameter', function test( t ) {
 	var x;
 	var v;
@@ -140,6 +203,29 @@ tape( 'the function supports a negative `stride` parameter', function test( t )
 	t.end();
 });
 
+tape( 'the function supports a negative `stride` parameter (accessors)', function test( t ) {
+	var x;
+	var v;
+
+	x = [
+		NaN,  // 4
+		NaN,
+		1.0,  // 3
+		2.0,
+		2.0,  // 2
+		-7.0,
+		-2.0, // 1
+		3.0,
+		4.0,  // 0
+		2.0
+	];
+
+	v = nanmax( 5, toAccessorArray( x ), -2 );
+
+	t.strictEqual( v, 4.0, 'returns expected value' );
+	t.end();
+});
+
 tape( 'if provided a `stride` parameter equal to `0`, the function returns the first element', function test( t ) {
 	var x;
 	var v;
@@ -152,6 +238,18 @@ tape( 'if provided a `stride` parameter equal to `0`, the function returns the f
 	t.end();
 });
 
+tape( 'if provided a `stride` parameter equal to `0`, the function returns the first element (accessors)', function test( t ) {
+	var x;
+	var v;
+
+	x = [ 1.0, -2.0, -4.0, 5.0, 3.0 ];
+
+	v = nanmax( x.length, toAccessorArray( x ), 0 );
+	t.strictEqual( v, 1.0, 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'the function supports view offsets', function test( t ) {
 	var x0;
 	var x1;