# Function ifElse

Execute a conditional expression.

In case of a matrix or array, the test is done element wise, the true and false part can be either a matrix/array with the same size of the condition, or a scalar value.


## Syntax

```js
math.ifElse(condition, trueExpr, falseExpr
```

### Parameters

Parameter | Type | Description
--------- | ---- | -----------
`condition` | Number | Boolean | String | Complex | BigNumber | Unit | Matrix | Array |  The conditional expression
`trueExpr` | * | The true expression
`falseExpr` | * | The false expression

### Returns

Type | Description
---- | -----------
* | The evaluated return expression


## Examples

```js
var math = mathjs();

math.ifElse(true, 'yes', 'no');           // returns 'yes'
math.ifElse([4, 6, 0, -1], true, false);  // returns [true, true, false, true]
```




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