text: /**
  * @license Apache-2.0
  *
  * Copyright (c) 2021 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 tape = require( 'tape' );
  var addf = require( '@stdlib/math/base/ops/addf' );
  var Float32Array = require( '@stdlib/array/float32' );
  var smap2 = require( './../lib/ndarray.js' );
  
  
  // TESTS //
  
  tape( 'main export is a function', function test( t ) {
  	t.ok( true, __filename );
  	t.strictEqual( typeof smap2, 'function', 'main export is a function' );
  	t.end();
  });
  
  tape( 'the function has an arity of 11', function test( t ) {
  	t.strictEqual( smap2.length, 11, 'arity of 11' );
  	t.end();
  });
  
  tape( 'the function applies a function to indexed strided array elements', function test( t ) {
  	var expected;
  	var x;
  	var y;
  	var z;
  	var i;
  
  	x = new Float32Array( [ -1.0, -2.0, -3.0, -4.0, -5.0 ] );
  	y = new Float32Array( [ 1.0, 1.0, 2.0, 2.0, 3.0 ] );
  	z = new Float32Array( [ 0.0, 0.0, 0.0, 0.0, 0.0 ] );
  
  	expected = new Float32Array( x.length );
  	for ( i = 0; i < x.length; i++ ) {
  		expected[ i ] = addf( x[ i ], y[ i ] );
  	}
  
  	smap2( x.length, x, 1, 0, y, 1, 0, z, 1, 0, addf );
  
  	t.deepEqual( z, expected, 'deep equal' );
  	t.end();
  });
  
  tape( 'the function supports an `x` stride', function test( t ) {
  	var expected;
  	var x;
  	var y;
  	var z;
  	var N;
  
  	x = new Float32Array([
  		-1.0, // 0
  		-2.0,
  		-3.0, // 1
  		-4.0,
  		-5.0  // 2
  	]);
  	y = new Float32Array([
  		1.0, // 0
  		1.0, // 1
  		2.0, // 2
  		2.0,
  		3.0
  	]);
  	z = new Float32Array([
  		0.0, // 0
  		0.0, // 1
  		0.0, // 2
  		0.0,
  		0.0
  	]);
  	N = 3;
  
  	smap2( N, x, 2, 0, y, 1, 0, z, 1, 0, addf );
  
  	expected = new Float32Array([
  		addf( x[ 0 ], y[ 0 ] ),
  		addf( x[ 2 ], y[ 1 ] ),
  		addf( x[ 4 ], y[ 3 ] ),
  		0.0,
  		0.0
  	]);
  
  	t.deepEqual( z, expected, 'deep equal' );
  	t.end();
  });
  
  tape( 'the function supports an `x` offset', function test( t ) {
  	var expected;
  	var x;
  	var y;
  	var z;
  	var N;
  
  	x = new Float32Array([
  		-1.0,
  		-2.0,
  		-3.0, // 0
  		-4.0, // 1
  		-5.0  // 2
  	]);
  	y = new Float32Array([
  		1.0, // 0
  		1.0, // 1
  		2.0, // 2
  		2.0,
  		3.0
  	]);
  	z = new Float32Array([
  		0.0, // 0
  		0.0, // 1
  		0.0, // 2
  		0.0,
  		0.0
  	]);
  	N = 3;
  
  	smap2( N, x, 1, 2, y, 1, 0, z, 1, 0, addf );
  
  	expected = new Float32Array([
  		addf( x[ 2 ], y[ 0 ] ),
  		addf( x[ 3 ], y[ 1 ] ),
  		addf( x[ 4 ], y[ 2 ] ),
  		0.0,
  		0.0
  	]);
  
  	t.deepEqual( z, expected, 'deep equal' );
  	t.end();
  });
  
  tape( 'the function supports a `y` stride', function test( t ) {
  	var expected;
  	var x;
  	var y;
  	var z;
  	var N;
  
  	x = new Float32Array([
  		-1.0, // 0
  		-2.0, // 1
  		-3.0, // 2
  		-4.0,
  		-5.0
  	]);
  	y = new Float32Array([
  		1.0, // 0
  		1.0,
  		2.0, // 1
  		2.0,
  		3.0  // 2
  	]);
  	z = new Float32Array([
  		0.0, // 0
  		0.0, // 1
  		0.0, // 2
  		0.0,
  		0.0
  	]);
  	N = 3;
  
  	smap2( N, x, 1, 0, y, 2, 0, z, 1, 0, addf );
  
  	expected = new Float32Array([
  		addf( x[ 0 ], y[ 0 ] ),
  		addf( x[ 1 ], y[ 2 ] ),
  		addf( x[ 2 ], y[ 4 ] ),
  		0.0,
  		0.0
  	]);
  
  	t.deepEqual( z, expected, 'deep equal' );
  	t.end();
  });
  
  tape( 'the function supports a `y` offset', function test( t ) {
  	var expected;
  	var x;
  	var y;
  	var z;
  	var N;
  
  	x = new Float32Array([
  		-1.0, // 0
  		-2.0, // 1
  		-3.0, // 2
  		-4.0,
  		-5.0
  	]);
  	y = new Float32Array([
  		1.0,
  		1.0,
  		2.0, // 0
  		2.0, // 1
  		3.0  // 2
  	]);
  	z = new Float32Array([
  		0.0, // 0
  		0.0, // 1
  		0.0, // 2
  		0.0,
  		0.0
  	]);
  	N = 3;
  
  	smap2( N, x, 1, 0, y, 1, 2, z, 1, 0, addf );
  
  	expected = new Float32Array([
  		addf( x[ 0 ], y[ 2 ] ),
  		addf( x[ 1 ], y[ 3 ] ),
  		addf( x[ 2 ], y[ 4 ] ),
  		0.0,
  		0.0
  	]);
  
  	t.deepEqual( z, expected, 'deep equal' );
  	t.end();
  });
  
  tape( 'the function supports a `z` stride', function test( t ) {
  	var expected;
  	var x;
  	var y;
  	var z;
  	var N;
  
  	x = new Float32Array([
  		-1.0, // 0
  		-2.0, // 1
  		-3.0, // 2
  		-4.0,
  		-5.0
  	]);
  	y = new Float32Array([
  		1.0, // 0
  		1.0, // 1
  		2.0, // 2
  		2.0,
  		3.0
  	]);
  	z = new Float32Array([
  		0.0, // 0
  		0.0,
  		0.0, // 1
  		0.0,
  		0.0  // 2
  	]);
  	N = 3;
  
  	smap2( N, x, 1, 0, y, 1, 0, z, 2, 0, addf );
  
  	expected = new Float32Array([
  		addf( x[ 0 ], y[ 0 ] ),
  		0.0,
  		addf( x[ 1 ], y[ 1 ] ),
  		0.0,
  		addf( x[ 2 ], y[ 2 ] )
  	]);
  
  	t.deepEqual( z, expected, 'deep equal' );
  	t.end();
  });
  
  tape( 'the function supports a `z` offset', function test( t ) {
  	var expected;
  	var x;
  	var y;
  	var z;
  	var N;
  
  	x = new Float32Array([
  		-1.0, // 0
  		-2.0, // 1
  		-3.0, // 2
  		-4.0,
  		-5.0
  	]);
  	y = new Float32Array([
  		1.0, // 0
  		1.0, // 1
  		2.0, // 2
  		2.0,
  		3.0
  	]);
  	z = new Float32Array([
  		0.0,
  		0.0,
  		0.0, // 0
  		0.0, // 1
  		0.0  // 2
  	]);
  	N = 3;
  
  	smap2( N, x, 1, 0, y, 1, 0, z, 1, 2, addf );
  
  	expected = new Float32Array([
  		0.0,
  		0.0,
  		addf( x[ 0 ], y[ 0 ] ),
  		addf( x[ 1 ], y[ 1 ] ),
  		addf( x[ 2 ], y[ 2 ] )
  	]);
  
  	t.deepEqual( z, expected, 'deep equal' );
  	t.end();
  });
  
  tape( 'the function returns a reference to the destination array', function test( t ) {
  	var out;
  	var x;
  	var y;
  	var z;
  
  	x = new Float32Array( [ -1.0, -2.0, -3.0, -4.0, -5.0 ] );
  	y = new Float32Array( [ 1.0, 1.0, 2.0, 2.0, 3.0 ] );
  	z = new Float32Array( [ 0.0, 0.0, 0.0, 0.0, 0.0 ] );
  
  	out = smap2( x.length, x, 1, 0, y, 1, 0, z, 1, 0, addf );
  
  	t.strictEqual( out, z, 'same reference' );
  	t.end();
  });
  
  tape( 'if provided an `N` parameter less than or equal to `0`, the function returns the destination array unchanged', function test( t ) {
  	var expected;
  	var x;
  	var y;
  	var z;
  
  	x = new Float32Array( [ -1.0, -2.0, -3.0, -4.0, -5.0 ] );
  	y = new Float32Array( [ 1.0, 1.0, 2.0, 2.0, 3.0 ] );
  	z = new Float32Array( [ 0.0, 0.0, 0.0, 0.0, 0.0 ] );
  
  	expected = new Float32Array( [ 0.0, 0.0, 0.0, 0.0, 0.0 ] );
  
  	smap2( -1, x, 1, 0, y, 1, 0, z, 1, 0, addf );
  	t.deepEqual( z, expected, 'returns expected value' );
  
  	smap2( 0, x, 1, 0, y, 1, 0, z, 1, 0, addf );
  	t.deepEqual( z, expected, 'returns expected value' );
  
  	t.end();
  });
  
  tape( 'the function supports negative strides', function test( t ) {
  	var expected;
  	var x;
  	var y;
  	var z;
  	var N;
  
  	x = new Float32Array([
  		-1.0, // 2
  		-2.0,
  		-3.0, // 1
  		-4.0,
  		-5.0  // 0
  	]);
  	y = new Float32Array([
  		1.0,
  		1.0, // 2
  		2.0, // 1
  		2.0, // 0
  		3.0
  	]);
  	z = new Float32Array([
  		0.0, // 2
  		0.0, // 1
  		0.0, // 0
  		0.0,
  		0.0
  	]);
  	N = 3;
  
  	smap2( N, x, -2, x.length-1, y, -1, y.length-2, z, -1, 2, addf );
  
  	expected = new Float32Array([
  		addf( x[ 0 ], y[ 1 ] ),
  		addf( x[ 2 ], y[ 2 ] ),
  		addf( x[ 4 ], y[ 3 ] ),
  		0.0,
  		0.0
  	]);
  
  	t.deepEqual( z, expected, 'deep equal' );
  	t.end();
  });
  
  tape( 'the function supports complex access patterns', function test( t ) {
  	var expected;
  	var x;
  	var y;
  	var z;
  	var N;
  
  	x = new Float32Array([
  		-1.0,
  		-2.0, // 0
  		-3.0,
  		-4.0, // 1
  		-5.0,
  		-6.0  // 2
  	]);
  	y = new Float32Array([
  		1.0,
  		1.0,
  		2.0,
  		2.0, // 2
  		3.0, // 1
  		3.0  // 0
  	]);
  	z = new Float32Array([
  		0.0, // 2
  		0.0,
  		0.0, // 1
  		0.0,
  		0.0, // 0
  		0.0
  	]);
  	N = 3;
  
  	smap2( N, x, 2, 1, y, -1, y.length-1, z, -2, z.length-2, addf );
  
  	expected = new Float32Array([
  		addf( x[ 5 ], y[ 3 ] ),
  		0.0,
  		addf( x[ 3 ], y[ 4 ] ),
  		0.0,
  		addf( x[ 1 ], y[ 5 ] ),
  		0.0
  	]);
  
  	t.deepEqual( z, expected, 'deep equal' );
  	t.end();
  });
  