# CellValueOverride

Canonical page: https://www.adaptabletools.com/docs/reference/cellvalueoverride

What-if substitute for one column of the row being evaluated.
Does not mutate grid (or data-set) data; other rows are unaffected.

```ts title="TypeScript"
export interface CellValueOverride 
```

## Properties

| Property | Type | Description |
| --- | --- | --- |
| [columnId](https://www.adaptabletools.com/docs/reference/cellvalueoverride.md#columnid) | `string` | Column whose value is replaced for this evaluation only. |
| [value](https://www.adaptabletools.com/docs/reference/cellvalueoverride.md#value) | `unknown` | Value used in place of the cell's current value. The grid data is not changed. |

## Property Details

### columnId

Column whose value is replaced for this evaluation only.

```ts title="TypeScript"
columnId: string;
```

###### Property Value

`string`

### value

Value used in place of the cell's current value. The grid data is not changed.

```ts title="TypeScript"
value: unknown;
```

###### Property Value

`unknown`