caseq
caseq(
g_keyForm
l_clause1
[ l_clause2 ... ]
)
=> g_result / nil
Description
Works like the case() function, but uses eq() to find a matching clause instead of the equal() function. The keys used with caseq() should therefore not be strings or lists. In case you want to use a string value or a list, SKILL recommends using the case() function. See eq for details on the difference between the eq() and equal() functions.
Arguments
|
g_keyForm
|
An expression whose value is evaluated and tested for equality against the comparators in each clause. A match occurs when either the selector is equal to the comparator or the selector is equal to one of the elements in the list given as the comparator.
If a match is found, the expressions in that clause and that clause only (that is, the first match) are executed. The value of case is then the value of the last expression evaluated (that is, the last expression in the clause selected).
If there is no match, case returns nil.
|
|
l_clause1
|
An expression whose first element is an atom or list of atoms to be compared against the value of g_keyForm. The remainder of the l_clause is evaluated if a match is found.
|
|
l_clause2
|
Zero or more clauses of the same form as l_clause1.
|
Value Returned
|
g_result
|
The value of the last expression evaluated in the matched clause, or nil if there is no match.
|
|
nil
|
If there is no match.
|
Examples
caseq(value
((nil) printf("Failed.\n"))
(indeterminate printf("Indeterminate.\n"))
((t) printf("Succeeded.\n"))
(t printf("Default.\n"))
))
Related Topics
Flow Control Functions
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