mathjs/docs/reference/functions/isNumeric.md

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser with support for symbolic computation, comes with a large set of built-in functions and constants, and offers an integrated solution to work with dif

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# Function isNumeric

Test whether a value is an numeric value.

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


## Syntax

```js
math.isNumeric(x)
```

### Parameters

Parameter | Type | Description
--------- | ---- | -----------
`x` | * | Value to be tested

### Returns

Type | Description
---- | -----------
boolean | Returns true when `x` is a `number`, `BigNumber`, `Fraction`, or `boolean`. Returns false for other types. Throws an error in case of unknown types.


## Examples

```js
math.isNumeric(2)                     // returns true
math.isNumeric('2')                   // returns false
math.hasNumericValue('2')             // returns true
math.isNumeric(0)                     // returns true
math.isNumeric(math.bignumber(500))   // returns true
math.isNumeric(math.fraction(4))      // returns true
math.isNumeric(math.complex('2-4i')   // returns false
math.isNumeric([2.3, 'foo', false])   // returns [true, false, true]
```


## See also

[isZero](isZero.md),
[isPositive](isPositive.md),
[isNegative](isNegative.md),
[isInteger](isInteger.md),
[hasNumericValue](hasNumericValue.md)