* Error codes — correct.
* Their personal codes — correct.
* Multiple codes of conduct — correct.
And then computer code is used roughly like the noun 'writing' except you can say writings where appropriate.
- Computer code is seen as a continuous substance or body of work, like "writing" or "music."
- Other types of codes are seen as discrete units or systems.
It's similar to how we say "information" (uncountable) but "facts" (countable), even though they're related concepts.
Hearing someone talk about ‘codes’ has the same weird vibe as when they talk about ‘Legos’.
Also why not pluralise all words? Sources codes.
* Error codes — correct.
* Their personal codes — correct.
* Multiple codes of conduct — correct.
And then computer code is used roughly like the noun 'writing' except you can say writings where appropriate.