> For the complete documentation index, see [llms.txt](https://docs.atfinity.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.atfinity.io/rule-language/operators/list-operators/all.md).

# ALL

### Description

With `ALL`, you evaluate if all values in the list is true.

### Examples

```
ALL([true, true, false])
```

This evaluates to `false`, since one of the values in the list is false.

```
ALL(
    get_properties(instances(Person), 'is_onboarded')
)
```

In this example, we go over all the people in the current case and retrieve their value `'is_onboarded'`. If all of these values are true, the whole expression is true. Thus, this evaluates true if everybody in the case has already been onboarded.

### Empty lists

`ALL([])` evaluates to `true`. When there are no elements to check, the condition "all elements satisfy the property" is vacuously true. Put differently, `true` is the identity for logical AND: starting from `true` and folding with AND over zero elements leaves the result at `true`.

This means a check like `ALL(get_properties(instances(Person), 'is_onboarded'))` returns `true` when there are no `Person` instances in the case. If you need to require at least one element, combine it with a count check, for example:

```
COUNT(instances(Person)) > 0 AND ALL(
    get_properties(instances(Person), 'is_onboarded')
)
```


---

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