Optimize quickfixType Function for Performance & Readability #691
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| allowedValues := d.FieldTypeByTag[int(field.tag)].Enums | ||
| if len(allowedValues) != 0 { | ||
| if _, validValue := allowedValues[string(field.value)]; !validValue { | ||
| return ValueIsIncorrect(field.tag) | ||
| } | ||
| } | ||
| // Define field type mappings for easy lookup | ||
| fieldTypeMapping := map[string]FieldValue{ |
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This instantiation performs a lot of unnecessary allocations which will negatively impact performance
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I do like the addition of comments on this path to help the developer, but on a hot path (versus the code generation path you changed otherwise) a switch statement will perform better than a map lookup. A blurb on why that’s the case: https://stackoverflow.com/questions/46789259/map-vs-switch-performance-in-go
| case "PERCENTAGE": | ||
| fallthrough | ||
| case "FLOAT": | ||
| // Define mappings of FIX field types to QuickFIX types |
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Now I do like the change here because it’s code generation and readability is more important than performance in this regard
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Key Optimizations:
✅ Replaces
fallthroughwith map lookups• Instead of a long switch with repeated
fallthroughstatements, we usemap[string]bool.• This makes lookups
O(1)instead of scanning all cases inO(n)time.✅ Improves Readability
• Grouping similar types into separate maps makes the function easier to read and maintain.
• The switch statement is shorter and clearer.
✅ Eliminates Unnecessary Variables
• Returns values directly instead of assigning to
quickfixType.• Instead of assigning prototype inside a switch, we fetch it directly from the map.
• If the type doesn’t exist in
fieldTypeMapping, the function exits early.