feat: add the JS native files

lib/node_modules/@stdlib/stats/base/dists/degenerate/pdf/benchmark/benchmark.native.js

@@ -0,0 +1,70 @@
+/**
+* @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 resolve = require( 'path' ).resolve;
+var bench = require( '@stdlib/bench' );
+var Float64Array = require( '@stdlib/array/float64' );
+var randu = require( '@stdlib/random/base/randu' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var tryRequire = require( '@stdlib/utils/try-require' );
+var pkg = require( './../package.json' ).name;
+
+
+// VARIABLES //
+
+var pdf = tryRequire( resolve( __dirname, './../lib/native.js' ) );
+var opts = {
+	'skip': ( pdf instanceof Error )
+};
+
+
+// MAIN //
+
+bench( pkg+'::native', opts, function benchmark( b ) {
+	var len;
+	var x;
+	var mu;
+	var y;
+	var i;
+
+	len = 100;
+	x = new Float64Array( len );
+	mu = new Float64Array( len );
+	for ( i = 0; i < len; i++ ) {
+		x[ i ] = ( randu() * 20.0 ) - 10.0;
+		mu[ i ] = ( randu() * 40.0 ) - 20.0;
+	}
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		y = pdf( x[ i % len ], mu[ i % len ] );
+		if ( isnan( y ) ) {
+			b.fail( 'should not return NaN' );
+		}
+	}
+	b.toc();
+	if ( isnan( y ) ) {
+		b.fail( 'should not return NaN' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});

lib/node_modules/@stdlib/stats/base/dists/degenerate/pdf/lib/native.js

@@ -0,0 +1,59 @@
+/**
+* @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 addon = require( './../src/addon.node' );
+
+
+// MAIN //
+
+/**
+* Evaluates the probability density function (PDF) for a degenerate distribution centered at `mu`.
+*
+* @private
+* @param {number} x - input value
+* @param {number} mu - constant value of the distribution
+* @returns {number} evaluated probability density function
+*
+* @example
+* var y = pdf( 3.0, 3.0 );
+* // returns Infinity
+*
+* @example
+* var y = pdf( 2.0, 3.0 );
+* // returns 0.0
+*
+* @example
+* var y = pdf( NaN, 2.0 );
+* // returns NaN
+*
+* @example
+* var y = pdf( 3.0, NaN );
+* // returns NaN
+*/
+function pdf( x, mu ) {
+	return addon( x, mu );
+}
+
+
+// EXPORTS //
+
+module.exports = pdf;

lib/node_modules/@stdlib/stats/base/dists/degenerate/pdf/test/test.native.js

@@ -0,0 +1,86 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2018 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 resolve = require( 'path' ).resolve;
+var tape = require( 'tape' );
+var tryRequire = require( '@stdlib/utils/try-require' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var PINF = require( '@stdlib/constants/float64/pinf' );
+
+
+// VARIABLES //
+
+var pdf = tryRequire( resolve( __dirname, './../lib/native.js' ) );
+var opts = {
+	'skip': ( pdf instanceof Error )
+};
+
+
+// TESTS //
+
+tape( 'main export is a function', opts, function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof pdf, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'if provided `NaN` for any parameter, the function returns `NaN`', opts, function test( t ) {
+	var y;
+
+	y = pdf( NaN, 0.0 );
+	t.equal( isnan( y ), true, 'returns NaN' );
+
+	y = pdf( 0.0, NaN );
+	t.equal( isnan( y ), true, 'returns NaN' );
+
+	y = pdf( NaN, NaN );
+	t.equal( isnan( y ), true, 'returns NaN' );
+
+	t.end();
+});
+
+tape( 'the function returns `+Infinity` if provided `x` equal to `mu`', opts, function test( t ) {
+	var y;
+
+	y = pdf( 2.0, 2.0 );
+	t.equal( y, PINF, 'returns +Infinity' );
+
+	y = pdf( 0.0, 0.0 );
+	t.equal( y, PINF, 'returns +Infinity' );
+
+	y = pdf( -3.0, -3.0 );
+	t.equal( y, PINF, 'returns +Infinity' );
+
+	t.end();
+});
+
+tape( 'the function returns `0.0` if provided `x` not equal to `mu`', opts, function test( t ) {
+	var y;
+
+	y = pdf( 2.0, 3.0 );
+	t.equal( y, 0.0, 'returns 0.0' );
+
+	y = pdf( 4.0, 3.0 );
+	t.equal( y, 0.0, 'returns 0.0' );
+
+	t.end();
+});