# containsAll

Source: https://taxilang.org/docs/language/stdlib/containsAll

**Full name:** `taxi.stdlib.containsAll`

## Signature

```taxi
declare extension function <T> containsAll(collection: T[], searchTarget:T[]): Boolean
```

## Description

Returns `true` if the collection contains every element in the search targets array.

Returns `true` when `searchTargets` is empty (an empty set is a subset of every set).

```taxi
// Check whether a product has all required tags
find {
   hasCertified: Boolean = ProductTag[].containsAll(['certified', 'in-stock'])
}
```

**Known limitation:** When the collection uses a semantic type (e.g. `ProductTag inherits String`),
passing string literals as `searchTargets` always returns `false` due to a type comparison bug.
See `problems/containsAll.md`. Use a `String[]` collection as a workaround.

## Examples

Returns `true` when the collection contains all specified search values, `false` if any are missing.

Schema:

```taxi
model Product {
   name: String
   tags: String[]
}
```

Query:

```taxi
given {
   product: Product = { name: 'Laptop', tags: ['electronics', 'portable', 'work'] }
}
find {
   hasBothTags: Boolean = product.tags.containsAll(['electronics', 'portable'])
   missingTag: Boolean = product.tags.containsAll(['electronics', 'gaming'])
}
```

Result:

```json
{
  "hasBothTags": true,
  "missingTag": false
}
```