mathjs/docs/reference/functions/isZero.md

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser and offers an integrated solution to work with numbers, big numbers, complex numbers, units, and matrices.

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# Function isZero

Test whether a value is zero.
The function can check for zero for types `number`, `BigNumber`, `Fraction`,
`Complex`, and `Unit`.

The function is evaluated element-wise in case of Array or Matrix input.


## Syntax

```js
math.isZero(x)
```

### Parameters

Parameter | Type | Description
--------- | ---- | -----------
`x` | number &#124; BigNumber &#124; Complex &#124; Fraction &#124; Unit &#124; Array &#124; Matrix | Value to be tested

### Returns

Type | Description
---- | -----------
boolean | Returns true when `x` is zero. Throws an error in case of an unknown data type.


## Examples

```js
math.isZero(0);                     // returns true
math.isZero(2);                     // returns false
math.isZero(0.5);                   // returns false
math.isZero(math.bignumber(0));     // returns true
math.isZero(math.fraction(0));      // returns true
math.isZero(math.fraction(1,3));    // returns false
math.isZero(math.complex('2 - 4i'); // returns false
math.isZero(math.complex('0i');     // returns true
math.isZero('0');                   // returns true
math.isZero('2');                   // returns false
math.isZero([2, 0, -3]');           // returns [false, true, false]
```


## See also

[isNumeric](isNumeric.md),
[isPositive](isPositive.md),
[isNegative](isNegative.md),
[isInteger](isInteger.md)