Collects the keys of a container into a list.
The filter and transform arguments should be nil or
functions of one argument. If filter is non-nil, then the
list returned will contain only keys that return true. If
transform is non-nil, then it will be applied to each key
that passes the filter.
| collect-keys < metabang.cl-containers:associative-container-mixin > |
| collect-keys < hash-table > |
| collect-keys < list > |
| collect-keys < metabang.cl-containers:stable-associative-container > |