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# Case Statement Performance Optimization - AL Code Samples
## Frequency-Based Ordering
```al
procedure ProcessTransactionOptimized(TransactionType: Text[20]; Amount: Decimal): Boolean
begin
// Order by frequency - most common first
case TransactionType of
'SALE': // 60% of transactions
exit(ProcessSaleTransaction(Amount));
'PAYMENT': // 25% of transactions
exit(ProcessPaymentTransaction(Amount));
'REFUND': // 10% of transactions
exit(ProcessRefundTransaction(Amount));
else
exit(ProcessUnknownTransaction(TransactionType, Amount));
end;
end;
```
## Enum vs Text Performance
```al
// Faster enum-based approach
procedure ProcessTransactionEnum(TransactionType: Enum "Transaction Type"; Amount: Decimal): Boolean
begin
case TransactionType of
TransactionType::Sale:
exit(ProcessSaleTransaction(Amount));
TransactionType::Payment:
exit(ProcessPaymentTransaction(Amount));
else
exit(false);
end;
end;
```
## Dictionary Alternative for Large Case Sets
```al
procedure ProcessWithDictionary(ProcessingType: Text[20]; Data: Text): Text
var
ProcessingFunctions: Dictionary of [Text, Integer];
FunctionId: Integer;
begin
ProcessingFunctions.Add('FORMAT', 1);
ProcessingFunctions.Add('VALIDATE', 2);
ProcessingFunctions.Add('TRANSFORM', 3);
if ProcessingFunctions.Get(ProcessingType, FunctionId) then
case FunctionId of
1: exit(FormatData(Data));
2: exit(ValidateData(Data));
3: exit(TransformData(Data));
end;
exit('Unknown processing type');
end;
```