30-seconds-of-code/snippets/isNegativeZero.md

title, tags, expertise, firstSeen, lastUpdated

title	tags	expertise	firstSeen	lastUpdated
Number is negative zero	math	intermediate	2018-11-12T15:45:36+02:00	2020-10-20T23:02:01+03:00

Checks if the given value is equal to negative zero (-0).

• Check whether a passed value is equal to 0 and if 1 divided by the value equals -Infinity.

const isNegativeZero = val => val === 0 && 1 / val === -Infinity;

isNegativeZero(-0); // true
isNegativeZero(0); // false