# no-compare-neg-zero

Disallow comparison against -0 which yields unexpected behavior.

Comparison against -0 causes unwanted behavior because it passes for both -0 and +0. That is, x == -0 and x == +0 both pass under the same circumstances. If a user wishes to compare against -0 they should use Object.is(x, -0).

# Incorrect Code Examples

if (x === -0) {
       // ^^ this comparison works for both -0 and +0
}

# Correct code examples

if (x === 0) {
    /* */
}

if (Object.is(x, -0)) {
    /* */
}

x == -0

x != -0

x === -0

-0 === -0

-0 == x

-0 >= 1

x < -0

x !== -0

x === 0

0 === 0

Object.is(x, -0)

Source (opens new window)