Metadata

ID: javascript-best-practices/no-compare-neg-zero

Language: JavaScript

Severity: Error

Category: Best Practices

Description

In JavaScript, -0 and +0 are considered to be equal ((-0 === +0) // true). However, they behave differently in some operations. For instance, 1/-0 results in -Infinity, while 1/+0 results in +Infinity. Directly comparing with -0 can produce results that are hard to understand, and may lead to bugs.

Non-Compliant Code Examples

x === -0;
-0 === x;
x == -0;
-0 == x;
x > -0;
-0 > x;
x >= -0;
-0 >= x;
x < -0;
-0 < x;
x <= -0;
-0 <= x;

Compliant Code Examples

x === 0
0 === x
x == 0
0 == x
x === '0'
'0' === x
x == '0'
'0' == x
x === '-0'
'-0' === x
x == '-0'
'-0' == x
x === -1
-1 === x
x < 0
0 < x
x <= 0
0 <= x
x > 0
0 > x
x >= 0
0 >= x
x != 0
0 != x
x !== 0
0 !== x
Object.is(x, -0)

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