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base/dtype/README.md

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+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2023 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.
+
+-->
+
+# dtype
+
+> Return the data type of a provided [ndarray][@stdlib/ndarray/base/ctor].
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- Package usage documentation. -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var dtype = require( '@stdlib/ndarray/base/dtype' );
+```
+
+#### dtype( x )
+
+Returns the data type of a provided [ndarray][@stdlib/ndarray/base/ctor].
+
+```javascript
+var zeros = require( '@stdlib/ndarray/zeros' );
+
+var x = zeros( [ 3, 2, 3 ], {
+    'dtype': 'float64'
+});
+// returns <ndarray>
+
+var dt = dtype( x );
+// returns 'float64'
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+</section>
+
+<!-- /.notes -->
+
+<!-- Package usage examples. -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+<!-- eslint-disable new-cap -->
+
+```javascript
+var zeros = require( '@stdlib/ndarray/zeros' );
+var slice = require( '@stdlib/ndarray/slice' );
+var E = require( '@stdlib/slice/multi' );
+var S = require( '@stdlib/slice/ctor' );
+var dtype = require( '@stdlib/ndarray/base/dtype' );
+
+// Create an array:
+var x = zeros( [ 10, 10, 10, 10 ] );
+// returns <ndarray>
+
+// Define some slices:
+var slices = [
+    // :,:,:,:
+    E( null, null, null, null ),
+
+    // 5:10,4,2:4,::-1
+    E( S( 5, 10 ), 4, S( 2, 4 ), S( null, null, -1 ) ),
+
+    // :,:,2,:
+    E( null, null, 2, null ),
+
+    // 1,2,3,:
+    E( 1, 2, 3, null ),
+
+    // 1,3,::2,4::2
+    E( 1, 3, S( null, null, 2 ), S( 4, null, 2 ) )
+];
+
+// Determine the data type for each slice...
+var s;
+var i;
+for ( i = 0; i < slices.length; i++ ) {
+    s = slice( x, slices[ i ] );
+    console.log( '%s => %s', s.dtype, dtype( s ) );
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- Section to include cited references. If references are included, add a horizontal rule *before* the section. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="references">
+
+</section>
+
+<!-- /.references -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+[@stdlib/ndarray/base/ctor]: https://github.com/stdlib-js/ndarray/tree/main/base/ctor
+
+</section>
+
+<!-- /.links -->

base/dtype/benchmark/benchmark.js

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+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2023 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 bench = require( '@stdlib/bench' );
+var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
+var typedarray = require( '@stdlib/array/typed' );
+var ndarray = require( './../../../ctor' );
+var pkg = require( './../package.json' ).name;
+var dtype = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var values;
+	var dt;
+	var i;
+
+	values = [
+		ndarray( 'float64', typedarray( 20000, 'float64' ), [ 10, 10, 10, 1 ], [ 1000, 100, 10, 1 ], 100, 'row-major' ),
+		ndarray( 'int32', typedarray( 20000, 'int32' ), [ 5, 5, 5, 1, 1 ], [ 125, 25, 5, 1, 1 ], 50, 'row-major' ),
+		ndarray( 'uint8', typedarray( 20000, 'uint8' ), [ 3, 4, 5 ], [ 20, 5, 1 ], 72, 'row-major' )
+	];
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		dt = dtype( values[ i%values.length ] );
+		if ( typeof dt !== 'string' ) {
+			b.fail( 'should return a string' );
+		}
+	}
+	b.toc();
+	if ( !isString( dt ) ) {
+		b.fail( 'should return a string' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});

base/dtype/docs/repl.txt

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+
+{{alias}}( x )
+    Returns the data type of a provided ndarray.
+
+    Parameters
+    ----------
+    x: ndarray
+        Input ndarray.
+
+    Returns
+    -------
+    dt: string
+        Data type.
+
+    Examples
+    --------
+    > var opts = { 'dtype': 'float64' };
+    > var dt = {{alias}}( {{alias:@stdlib/ndarray/zeros}}( [ 3, 3, 3 ], opts ) )
+    'float64'
+
+    See Also
+    --------
+

base/dtype/docs/types/index.d.ts

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+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2023 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.
+*/
+
+// TypeScript Version: 4.1
+
+/// <reference types="@stdlib/types"/>
+
+import { ndarray, DataType } from '@stdlib/types/ndarray';
+
+/**
+* Returns the data type of a provided ndarray.
+*
+* @param x - input ndarray
+* @returns data type
+*
+* @example
+* var zeros = require( `@stdlib/ndarray/zeros` );
+*
+* var x = zeros( [ 3, 3, 3 ], {
+*     'dtype': 'float64'
+* });
+*
+* var dt = dtype( x );
+* // returns 'float64'
+*/
+declare function dtype( x: ndarray ): DataType;
+
+
+// EXPORTS //
+
+export = dtype;

base/dtype/docs/types/test.ts

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+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2023 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.
+*/
+
+import zeros = require( './../../../../zeros' );
+import dtype = require( './index' );
+
+
+// TESTS //
+
+// The function returns a data type...
+{
+	dtype( zeros( [ 3, 2, 1 ] ) ); // $ExpectType DataType
+}
+
+// The compiler throws an error if the function is provided a value other than an ndarray...
+{
+	dtype( '5' ); // $ExpectError
+	dtype( 5 ); // $ExpectError
+	dtype( true ); // $ExpectError
+	dtype( false ); // $ExpectError
+	dtype( null ); // $ExpectError
+	dtype( undefined ); // $ExpectError
+	dtype( [ '1', '2' ] ); // $ExpectError
+	dtype( {} ); // $ExpectError
+	dtype( ( x: number ): number => x ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided an unsupported number of arguments...
+{
+	dtype(); // $ExpectError
+	dtype( zeros( [ 2, 2 ] ), {} ); // $ExpectError
+}

base/dtype/examples/index.js

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+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2023 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.
+*/
+
+/* eslint-disable new-cap */
+
+'use strict';
+
+var zeros = require( './../../../zeros' );
+var slice = require( './../../../slice' );
+var E = require( '@stdlib/slice/multi' );
+var S = require( '@stdlib/slice/ctor' );
+var dtype = require( './../lib' );
+
+// Create an array:
+var x = zeros( [ 10, 10, 10, 10 ] );
+// returns <ndarray>
+
+// Define some slices:
+var slices = [
+	// :,:,:,:
+	E( null, null, null, null ),
+
+	// 5:10,4,2:4,::-1
+	E( S( 5, 10 ), 4, S( 2, 4 ), S( null, null, -1 ) ),
+
+	// :,:,2,:
+	E( null, null, 2, null ),
+
+	// 1,2,3,:
+	E( 1, 2, 3, null ),
+
+	// 1,3,::2,4::2
+	E( 1, 3, S( null, null, 2 ), S( 4, null, 2 ) )
+];
+
+// Determine the data type of each slice...
+var s;
+var i;
+for ( i = 0; i < slices.length; i++ ) {
+	s = slice( x, slices[ i ] );
+	console.log( '%s => %s', s.dtype, dtype( s ) );
+}