# nullFill! {#nullfill}

**Parent topic:**[Functions](../../Functions/category.md)

## Syntax {#syntax}

`nullFill!(X, newValue)`

## Details {#details}

Please refer to [nullFill](nullFill.md). The only difference between `nullFill` and `nullFill!` is that the latter assigns the result to *X* and thus changing the value of *X* after the execution.

