node-is-factorial

Check if something is a factorial

Install

$ npm install --save is-factorial

Usage

const isFactorial = require('is-factorial');
 
isFactorial(120);
//=> true
 
isFactorial('120');
//=> true
 
isFactorial('-1');
//=> false

Limitations

isFactorial returns false for numbers greater than 170!, which is the highest factorial that is smaller than Number.MAX_VALUE. If you need to work with numbers greater than 170!, feel free to open an issue.

License

Copyright 2018 Nikola Trubitsyn

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.