<!-- @license Apache-2.0 Copyright (c) 2018 The Stdlib Authors. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --> # isNonNegativeInteger > Test if a finite [double-precision floating-point number][ieee754] is a nonnegative integer. <section class="usage"> ## Usage ```javascript var isNonNegativeInteger = require( '@stdlib/math/base/assert/is-nonnegative-integer' ); ``` #### isNonNegativeInteger( x ) Tests if a finite [double-precision floating-point number][ieee754] is a nonnegative `integer`. ```javascript var bool = isNonNegativeInteger( 1.0 ); // returns true bool = isNonNegativeInteger( 0.0 ); // returns true bool = isNonNegativeInteger( -10.0 ); // returns false ``` </section> <!-- /.usage --> <section class="notes"> ## Notes - The function assumes a **finite** `number`. If provided positive `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 && isNonNegativeInteger( x ) ); } var bool = check( Infinity ); // returns false ``` - The function does **not** distinguish between positive and negative `zero`. ```javascript var bool = isNonNegativeInteger( 0.0 ); // returns true bool = isNonNegativeInteger( -0.0 ); // returns true ``` </section> <!-- /.notes --> <section class="examples"> ## Examples <!-- eslint no-undef: "error" --> ```javascript var isNonNegativeInteger = require( '@stdlib/math/base/assert/is-nonnegative-integer' ); 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 ``` </section> <!-- /.examples --> <section class="links"> [ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985 </section> <!-- /.links -->