@stdlib/math-base-assert-is-even
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    0.0.5 • Public • Published

    isEven

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    Test if a finite numeric value is an even number.

    Installation

    npm install @stdlib/math-base-assert-is-even

    Usage

    var isEven = require( '@stdlib/math-base-assert-is-even' );

    isEven( x )

    Tests if a finite numeric value is an even number.

    var bool = isEven( 5.0 );
    // returns false
    
    bool = isEven( -2.0 );
    // returns true
    
    bool = isEven( 0.0 );
    // returns true
    
    bool = isEven( NaN );
    // returns false

    Notes

    • 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:

      function check( x ) {
          return (
              x < Infinity &&
              x > -Infinity &&
              isEven( x )
          );
      }
      
      var bool = check( Infinity );
      // returns false
      
      bool = check( -Infinity );
      // returns false

    Examples

    var randu = require( '@stdlib/random-base-randu' );
    var round = require( '@stdlib/math-base-special-round' );
    var isEven = require( '@stdlib/math-base-assert-is-even' );
    
    var bool;
    var x;
    var i;
    
    for ( i = 0; i < 100; i++ ) {
        x = round( randu()*100.0 );
        bool = isEven( x );
        console.log( '%d is %s', x, ( bool ) ? 'even' : 'not even' );
    }

    Notice

    This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

    For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

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    License

    See LICENSE.

    Copyright

    Copyright © 2016-2021. The Stdlib Authors.

    Install

    npm i @stdlib/math-base-assert-is-even

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    25

    Version

    0.0.5

    License

    Apache-2.0

    Unpacked Size

    36.1 kB

    Total Files

    10

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