isInteger.js

import { bind, curryN } from 'ramda';

import isFunction from './isFunction';
import ponyfill from './internal/ponyfills/Number.isInteger';

export const isIntegerPonyfill = curryN(1, ponyfill);

/**
 * Checks whether the passed value is an `integer`.
 *
 * @func isInteger
 * @memberOf RA
 * @since {@link https://char0n.github.io/ramda-adjunct/0.7.0|v0.7.0}
 * @category Type
 * @sig * -> Boolean
 * @param {*} val The value to test
 * @return {boolean}
 * @see {@link RA.isNotInteger|isNotInteger}
 * @example
 *
 * RA.isInteger(0); //=> true
 * RA.isInteger(1); //=> true
 * RA.isInteger(-100000); //=> true
 *
 * RA.isInteger(0.1);       //=> false
 * RA.isInteger(Math.PI);   //=> false
 *
 * RA.isInteger(NaN);       //=> false
 * RA.isInteger(Infinity);  //=> false
 * RA.isInteger(-Infinity); //=> false
 * RA.isInteger('10');      //=> false
 * RA.isInteger(true);      //=> false
 * RA.isInteger(false);     //=> false
 * RA.isInteger([1]);       //=> false
 */
const isInteger = isFunction(Number.isInteger)
  ? curryN(1, bind(Number.isInteger, Number))
  : isIntegerPonyfill;

export default isInteger;