Number is negative zero

OSCC · JavaScript, Math · Oct 20, 2020

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

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