In addition to retrieving a field from a Record, as outlined above in the Filters section, we sometimes need to refine
which fields we want to select. Or we may want to return a modified version of a field.
To do this, we rely on functions. The syntax for a function is <function name>
<open parenthesis> <args> <close parenthesis>, where <args> represents one
or more arguments separated by commas. An argument may be a string literal (such as
'hello') or a number literal (such as
48), or could
be a relative or absolute RecordPath (such as
/id). Additionally, we can use functions within a filter. For
example, we could use a RecordPath such as
]/id to retrieve the
id field of any person whose name is
empty. A listing of functions that are available and their corresponding documentation
can be found below in the Functions section.