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feat: add math/base/assert/is-evenf
PR-URL: #3077 Reviewed-by: Philipp Burckhardt <[email protected]>
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‎lib/node_modules/@stdlib/math/base/assert/is-evenf/README.md

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<!--
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@license Apache-2.0
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Copyright (c) 2024 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# isEvenf
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> Test if a finite single-precision floating-point number is an even number.
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<section class="usage">
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## Usage
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```javascript
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var isEvenf = require( '@stdlib/math/base/assert/is-evenf' );
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```
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#### isEvenf( x )
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Tests if a **finite** single-precision floating-point number is an even number.
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```javascript
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var bool = isEvenf( 5.0 );
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// returns false
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bool = isEvenf( -2.0 );
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// returns true
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bool = isEvenf( 0.0 );
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// returns true
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bool = isEvenf( NaN );
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// returns false
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```
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</section>
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<!-- /.usage -->
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<section class="notes">
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## Notes
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- The function assumes a **finite** `number`. If provided positive or negative `infinity`, the function will return `true`, when, in fact, the result is undefined. If `x` can be `infinite`, wrap the implementation as follows:
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```javascript
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function check( x ) {
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return (
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x < Infinity &&
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x > -Infinity &&
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isEvenf( x )
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);
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}
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var bool = check( Infinity );
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// returns false
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bool = check( -Infinity );
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// returns false
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```
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</section>
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<!-- /.notes -->
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<section class="examples">
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## Examples
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<!-- eslint no-undef: "error" -->
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```javascript
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var randu = require( '@stdlib/random/array/discrete-uniform' );
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var isEvenf = require( '@stdlib/math/base/assert/is-evenf' );
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var bool;
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var x;
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var i;
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x = randu( 100, 0, 100 );
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for ( i = 0; i < 100; i++ ) {
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bool = isEvenf( x[ i ] );
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console.log( '%d is %s', x[ i ], ( bool ) ? 'even' : 'not even' );
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}
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```
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</section>
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<!-- /.examples -->
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<!-- C interface documentation. -->
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* * *
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<section class="c">
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## C APIs
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<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
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<section class="intro">
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</section>
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<!-- /.intro -->
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<!-- C usage documentation. -->
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<section class="usage">
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### Usage
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```c
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#include "stdlib/math/base/assert/is_evenf.h"
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```
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#### stdlib_base_is_evenf( x )
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Tests if a finite single-precision floating-point number is an even number.
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```c
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bool out = stdlib_base_is_evenf( 1.0f );
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// returns false
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out = stdlib_base_is_evenf( 4.0f );
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// returns true
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```
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The function accepts the following arguments:
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- **x**: `[in] float` input value.
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```c
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bool stdlib_base_is_evenf( const float x );
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```
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</section>
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<!-- /.usage -->
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<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="notes">
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</section>
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<!-- /.notes -->
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<!-- C API usage examples. -->
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<section class="examples">
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### Examples
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```c
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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int main( void ) {
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float x;
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bool v;
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int i;
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for ( i = 0; i < 100; i++ ) {
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x = ( ( (float)rand() / (float)RAND_MAX ) * 100.0f );
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v = stdlib_base_is_evenf( x );
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printf( "x = %f, is_evenf(x) = %s\n", x, ( v ) ? "even" : "not even" );
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}
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}
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```
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</section>
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<!-- /.examples -->
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</section>
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<!-- /.c -->
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<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
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<section class="related">
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<!-- /.related -->
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<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="links">
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<!-- <related-links> -->
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<!-- </related-links> -->
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</section>
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<!-- /.links -->

‎lib/node_modules/@stdlib/math/base/assert/is-evenf/benchmark/benchmark.js

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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2024 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var bench = require( '@stdlib/bench' );
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var randu = require( '@stdlib/random/array/discrete-uniform' );
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var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
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var pkg = require( './../package.json' ).name;
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var isEvenf = require( './../lib' );
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// MAIN //
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bench( pkg, function benchmark( b ) {
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var x;
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var y;
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var i;
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x = randu( 100, -50, 50 );
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b.tic();
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for ( i = 0; i < b.iterations; i++ ) {
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y = isEvenf( x[ i % 100 ] );
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if ( typeof y !== 'boolean' ) {
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b.fail( 'should return a boolean' );
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}
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}
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b.toc();
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if ( !isBoolean( y ) ) {
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b.fail( 'should return a boolean' );
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}
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b.pass( 'benchmark finished' );
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b.end();
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});

‎lib/node_modules/@stdlib/math/base/assert/is-evenf/benchmark/benchmark.native.js

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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2024 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var resolve = require( 'path' ).resolve;
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var bench = require( '@stdlib/bench' );
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var randu = require( '@stdlib/random/array/discrete-uniform' );
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var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
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var tryRequire = require( '@stdlib/utils/try-require' );
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var pkg = require( './../package.json' ).name;
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// VARIABLES //
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var isEvenf = tryRequire( resolve( __dirname, './../lib/native.js' ) );
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var opts = {
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'skip': ( isEvenf instanceof Error )
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};
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// MAIN //
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bench( pkg, opts, function benchmark( b ) {
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var x;
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var y;
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var i;
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x = randu( 100, -50, 50 );
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b.tic();
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for ( i = 0; i < b.iterations; i++ ) {
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y = isEvenf( x[ i % 100 ] );
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if ( typeof y !== 'boolean' ) {
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b.fail( 'should return a boolean' );
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}
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}
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b.toc();
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if ( !isBoolean( y ) ) {
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b.fail( 'should return a boolean' );
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}
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b.pass( 'benchmark finished' );
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b.end();
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});

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