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What does “write-only code” mean?
The Jargon File defines write-only code as code so arcane, complex, or ill-structured that other people—and possibly even its author—cannot comprehend or modify it. The phrase is wordplay on “read-only memory.” The Jargon File’s entry treats it as a pejorative description, not a technical standard or a result a codebase can formally pass or fail.
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In practical use, the criticism is about whether a reader can follow what the code does and make changes safely. Code may run correctly and still be hard to revisit, explain, debug, or extend. “Write-only” is therefore a judgment about readability and maintainability, not whether the computer can execute the code.
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No. In Microsoft’s C# and Visual Basic guidance, a write-only property is a specific property design: it has a setter but no getter. That usage is not a synonym for code that is difficult to understand.
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Microsoft’s CA1044 rule says that allowing a value to be set while preventing it from being read does not provide security. The rule documentation also lists CA1044 as not enabled by default in .NET 10; consult the current CA1044 documentation if you need its present applicability or configuration details.
| Usage | What it describes | Scope |
|---|---|---|
| “Write-only code” | Code that is unusually difficult to understand or modify | Informal criticism of readability and maintainability |
| “Write-only property” | A property with a setter and no getter | Specific property-design guidance for C# and Visual Basic in Microsoft’s CA1044 documentation |
Can code be write-only even if it runs?
Yes. Execution and understandability are different things: code can produce the expected result while being difficult for a person to follow or safely change. The label is about the human cost of working with it, not whether it compiles or runs.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why can code become hard to understand later?
People lose the context in which they wrote code. An example discussed in an excerpt from Assembly Language Step-by-Step describes an author returning to code after time away and struggling to reconstruct how its instructions fit together. The example illustrates why working code can still be costly to revisit; it is not a universal rule about how all code behaves.
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Identifiers and comments can preserve some of that context by making a name’s purpose or an instruction’s intent easier to recover. They are useful when they clarify a real decision or relationship, rather than merely restating what a line already says. The cited excerpt is available through CiteSeerX.
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