Test if a finite numeric value is an odd number.
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> Test if a finite double-precision floating-point number is an odd number.
``bash`
npm install @stdlib/math-base-assert-is-odd
`javascript`
var isOdd = require( '@stdlib/math-base-assert-is-odd' );
#### isOdd( x )
Tests if a finite double-precision floating-point number is an odd number.
`javascript
var bool = isOdd( 5.0 );
// returns true
bool = isOdd( -2.0 );
// returns false
bool = isOdd( 0.0 );
// returns false
bool = isOdd( NaN );
// returns false
`
- 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:
`javascript
function check( x ) {
return (
x < Infinity &&
x > -Infinity &&
isOdd( x )
);
}
var bool = check( Infinity );
// returns false
bool = check( -Infinity );
// returns false
`
`javascript
var discreteUniform = require( '@stdlib/random-array-discrete-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var isOdd = require( '@stdlib/math-base-assert-is-odd' );
var opts = {
'dtype': 'float64'
};
var x = discreteUniform( 100, 0, 1000, opts );
function isOddWrapper( integer ) {
return ( isOdd( integer ) ) ? 'odd' : 'not odd';
}
logEachMap( '%d is %s', x, isOddWrapper );
`
*
`c`
#include "stdlib/math/base/assert/is_odd.h"
#### stdlib_base_is_odd( x )
Tests if a finite double-precision floating-point number is an odd number.
`c
#include
bool out = stdlib_base_is_odd( 1.0 );
// returns true
out = stdlib_base_is_odd( 4.0 );
// returns false
`
The function accepts the following arguments:
- x: [in] double input value.
`c`
bool stdlib_base_is_odd( const double x );
`c
#include "stdlib/math/base/assert/is_odd.h"
#include
#include
int main( void ) {
const double x[] = { 5.0, -5.0, 3.14, -3.14, 0.0, 0.0/0.0 };
bool b;
int i;
for ( i = 0; i < 6; i++ ) {
b = stdlib_base_is_odd( x[ i ] );
printf( "Value: %lf. Is Odd? %s.\n", x[ i ], ( b ) ? "True" : "False" );
}
}
`
*
- [@stdlib/math-base/assert/is-even][@stdlib/math/base/assert/is-even]: test if a finite numeric value is an even number.
*
This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].
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---
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Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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