is-triangular

Test if a number is a triangular number

Reference: Fastest method to define whether a number is a triangular number

Install

$ npm install --save is-triangular

Usage

var isTriangular = require('is-triangular');

isTriangular(1);
//=> true

isTriangular(2);
//=> false

isTriangular(3);
//=> true

isTriangular(4);
//=> false

isTriangular(10);
//=> true

License

MIT © Leonardo Borges Avelino