table-key-present?
Name
table-key-present? -- Checks a table for the presence of a given key
Type: generic
Synopsis
table-key-present?( table key, boolean);
Arguments
- table
An instance of <table> to be searched
- key
The key for which to search. Must be an instance
of the key class appropriate for the given table.
Return Values
- boolean
#t if the key is present, #f otherwise.
Description
This generic function on tables is used to check
for the presence
of a given key in a table. This function is similar
to table-lookup, but it returns a boolean indicator
rather than the value associated
with the key. Hence, it is of primary use for tables
that may contain #f as a value.