contains
check if a dict has a given value, or a list has a given element
(any xs, any x) -> boolean
If xs is a dict, returns whether x is a value in xs.
If xs is a list, returns whether x is an element in xs.
Returns nil if xs is nil.
Throws an error if xs is not a list or dict.
Parameters
| Name | Type | Description |
|---|---|---|
xs |
dict or list | The dict or list to check |
x |
string or long | The element to look for |