isNegativeZero.js

import { identical, curryN } from 'ramda';

/**
 * Checks if value is a negative zero (-0).
 *
 * @func isNegativeZero
 * @memberof RA
 * @since {@link https://char0n.github.io/ramda-adjunct/2.22.0|v2.22.0}
 * @category Type
 * @sig * -> Boolean
 * @param {*} val The value to test
 * @return {boolean}
 * @see @see {@link RA.isPositiveZero|isPositiveZero}
 * @example
 *
 * RA.isNegativeZero(-0); //=> true
 * RA.isNegativeZero(+0); //=> false
 * RA.isNegativeZero(0); //=> false
 * RA.isNegativeZero(null); //=> false
 */
const isNegativeZero = curryN(1, identical(-0));

export default isNegativeZero;