# none

> For the complete documentation index, see [llms.txt](https://kotlin.github.io/dataframe/llms.txt).

Checks that none of the rows in the [DataFrame](dataframe.html) satisfy the predicate.

API reference: [none](https://kotlin.github.io/dataframe/api-docs/core/org.jetbrains.kotlinx.dataframe.api/none.html)

Returns `Boolean` — `true` if none of the rows satisfy the predicate, `false` otherwise.

```KOTLIN
df.none { rowCondition }

rowCondition: (DataRow) -> Boolean
```

When called on a [DataColumn](datacolumn.html), checks that none of the values in the [DataColumn](datacolumn.html) satisfy the predicate.

Related operations: [any](any.html), [all](all.html), [filter](filter.html), [count](count.html).

## Examples

```KOTLIN
df
```

[Embedded content](./resources/noneDf.html)

Check that none of the persons' `age` is greater than 21:

```KOTLIN
df.none { age > 21 }
```

Output:

```TEXT
true
```

Check that there is no person with `age` equal to 15 and `name` equal to "Alice":

```KOTLIN
df.none { age == 15 && name == "Alice" }
```

Output:

```TEXT
false
```

Check that there is no name "Charlie" in the `name` column:

```KOTLIN
df.name.none { it == "Charlie" }
```

Output:

```TEXT
true
```