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isPrime

Test if a value is a prime number.

A prime number is defined as an integer value greater than 1 which is only divisible by 1 and itself.

Installation

npm install @stdlib/assert-is-prime

Alternatively,

• To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
• If you are using Deno, visit the deno branch (see README for usage intructions).
• For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).

The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

Usage

var isPrime = require( '@stdlib/assert-is-prime' );

isPrime( value )

Tests if a value is a prime number.

var Number = require( '@stdlib/number-ctor' );

var bool = isPrime( 5.0 );
// returns true

bool = isPrime( new Number( 5.0 ) );
// returns true

bool = isPrime( 3.14 );
// returns false

bool = isPrime( -5.0 );
// returns false

bool = isPrime( NaN );
// returns false

bool = isPrime( null );
// returns false

isPrime.isPrimitive( value )

Tests if a value is a primitive prime number.

var Number = require( '@stdlib/number-ctor' );

var bool = isPrime.isPrimitive( 5.0 );
// returns true

bool = isPrime.isPrimitive( new Number( 5.0 ) );
// returns false

isPrime.isObject( value )

Tests if a value is a Number object having a value which is a prime number.

var Number = require( '@stdlib/number-ctor' );

var bool = isPrime.isObject( 5.0 );
// returns false

bool = isPrime.isObject( new Number( 5.0 ) );
// returns true

Examples

var Number = require( '@stdlib/number-ctor' );
var isPrime = require( '@stdlib/assert-is-prime' );

var bool = isPrime( 5.0 );
// returns true

bool = isPrime( new Number( 5.0 ) );
// returns true

bool = isPrime( 11.0 );
// returns true

bool = isPrime( 2.0 );
// returns true

bool = isPrime( 3.14 );
// returns false

bool = isPrime( -5.0 );
// returns false

bool = isPrime( NaN );
// returns false

bool = isPrime( '0.5' );
// returns false

bool = isPrime( null );
// returns false

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See Also

• @stdlib/assert-is-composite: test if a value is a composite number.
• @stdlib/assert-is-integer: test if a value is a number having an integer value.
• @stdlib/assert-is-number: test if a value is a number.

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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.

Community

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.