Returns the result corresponding to the first matching value.
value (required) The value to test.
case 1 (required): The case to test the value against. If the <value> matches <case>, the following <result> is returned.
result 1 (required): The result to be returned if its preceding case matches the input value.
case 2+, result 2+ (optional): Several <case> <result> pairs can be listed in a single function. Every supplied case must have a corresponding result.
else (optional): The result to be returned if no cases match the value. If no <else> condition is supplied, a Null result is returned when no cases are met.