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Test if a finite double-precision floating-point number is a nonnegative integer.
To use in Observable,
isNonNegativeInteger = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-assert-is-nonnegative-integer@umd/browser.js' )To vendor stdlib functionality and avoid installing dependency trees for Node.js, you can use the UMD server build:
var isNonNegativeInteger = require( 'path/to/vendor/umd/math-base-assert-is-nonnegative-integer/index.js' )To include the bundle in a webpage,
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/math-base-assert-is-nonnegative-integer@umd/browser.js"></script>If no recognized module system is present, access bundle contents via the global scope:
<script type="text/javascript">
(function () {
window.isNonNegativeInteger;
})();
</script>Tests if a finite double-precision floating-point number is a nonnegative integer.
var bool = isNonNegativeInteger( 1.0 );
// returns true
bool = isNonNegativeInteger( 0.0 );
// returns true
bool = isNonNegativeInteger( -10.0 );
// returns false-
The function assumes a finite number. If provided positive
infinity, the function will returntrue, when, in fact, the result is undefined. Ifxcan beinfinite, wrap the implementation as follows:function check( x ) { return ( x < Infinity && isNonNegativeInteger( x ) ); } var bool = check( Infinity ); // returns false
-
The function does not distinguish between positive and negative
zero.var bool = isNonNegativeInteger( 0.0 ); // returns true bool = isNonNegativeInteger( -0.0 ); // returns true
<!DOCTYPE html>
<html lang="en">
<body>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/math-base-assert-is-nonnegative-integer@umd/browser.js"></script>
<script type="text/javascript">
(function () {
var bool = isNonNegativeInteger( 5.0 );
// returns true
bool = isNonNegativeInteger( 0.0 );
// returns true
bool = isNonNegativeInteger( -1.0 );
// returns false
bool = isNonNegativeInteger( 3.14 );
// returns false
bool = isNonNegativeInteger( NaN );
// returns false
})();
</script>
</body>
</html>@stdlib/math-base/assert/is-integer: test if a finite double-precision floating-point number is an integer.@stdlib/math-base/assert/is-negative-integer: test if a finite double-precision floating-point number is a negative integer.@stdlib/math-base/assert/is-nonpositive-integer: test if a finite double-precision floating-point number is a nonpositive integer.@stdlib/math-base/assert/is-positive-integer: test if a finite double-precision floating-point number is a positive integer.
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.
See LICENSE.
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