# 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')
)
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.atfinity.io/rule-language/operators/list-operators/all.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.