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

isNegativeZero

Checks if the given value is a negative zero -0.

Checks whether a passed value is equal to 0 and if one devided by the value equals -Infinity.

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

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