# User

### Fetch user information

**Parameters**:

`expansions`: The `expansions` applied for a user

Expansions options are below:

* ASSOCIATEDUSERS
* SHAREDINFORMATION
* ASSOCIATEDACCOUNT
* CUSTOMFIELDS
* ROLE

To fetch user information, the following API can be used.

{% tabs %}
{% tab title="Swift" %}

```swift
let userService = UserService()
userService.fetch(then: { result in 
	if let user = result.value {
		// Success
		completionHandler(user)
	} else {
		// failure
	}
})
```

{% endtab %}

{% tab title="Kotlin" %}

```kotlin
val userService = UserService()
userService.fetch { result: Result<User?> ->
    if (result?.value == null || result.throwable != null) {
        // failure
    } else {
        // Success
        val user = result.value
    }
}
```

{% endtab %}
{% endtabs %}

### Update user information

The HostApp can update the user information upon success.

#### Concrete example

To update user information, the following API can be used.

{% tabs %}
{% tab title="Swift" %}

```swift
let userService = UserService()
userService.update(displayName: displayName,
                   postalCode: postalCode,
                   gender: gender,
                   dateOfBirth: dateOfBirth, then: { result in
    switch result {
    case .sucess(_):
        // update successful
    case .failure(_):
        // error
    }
})
```

{% endtab %}
{% endtabs %}


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