mathjs
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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 isInteger
Test whether a value is an integer number.
The function supports `number`, `BigNumber`, and `Fraction`.
The function is evaluated element-wise in case of Array or Matrix input.
## Syntax
```js
math.isInteger(x)
```
### Parameters
Parameter | Type | Description
--------- | ---- | -----------
`x` | number | BigNumber | Fraction | Array | Matrix | Value to be tested
### Returns
Type | Description
---- | -----------
boolean | Returns true when `x` contains a numeric, integer value. Throws an error in case of an unknown data type.
## Examples
```js
math.isInteger(2) // returns true
math.isInteger(0) // returns true
math.isInteger(0.5) // returns false
math.isInteger(math.bignumber(500)) // returns true
math.isInteger(math.fraction(4)) // returns true
math.isInteger('3') // returns true
math.isInteger([3, 0.5, -2]) // returns [true, false, true]
math.isInteger(math.complex('2-4i') // throws an error
```
## See also
[isNumeric](isNumeric.md),
[isPositive](isPositive.md),
[isNegative](isNegative.md),
[isZero](isZero.md)