ramda-adjunct/src/isNegativeZero.js

Ramda Adjunct is the most popular and most comprehensive set of utilities for use with Ramda, providing a variety of useful, well tested functions with excellent documentation.

import { identical } 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 = identical(-0);

export default isNegativeZero;