@patrtorg/eum-magnam-ducimus

Is this value negative zero? === will lie to you.

Example

1var isNegativeZero = require('@patrtorg/eum-magnam-ducimus');
2var assert = require('assert');
3
4assert.notOk(isNegativeZero(undefined));
5assert.notOk(isNegativeZero(null));
6assert.notOk(isNegativeZero(false));
7assert.notOk(isNegativeZero(true));
8assert.notOk(isNegativeZero(0));
9assert.notOk(isNegativeZero(42));
10assert.notOk(isNegativeZero(Infinity));
11assert.notOk(isNegativeZero(-Infinity));
12assert.notOk(isNegativeZero(NaN));
13assert.notOk(isNegativeZero('foo'));
14assert.notOk(isNegativeZero(function () {}));
15assert.notOk(isNegativeZero([]));
16assert.notOk(isNegativeZero({}));
17
18assert.ok(isNegativeZero(-0));

Tests

Simply clone the repo, npm install, and run npm test