Miscellaneous cli-related parity fixes #5442
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| RunMode::Command(command) => { | ||
| debug!("Running command {}", command); | ||
| vm.run_code_string(scope, &command, "<stdin>".to_owned())?; | ||
| vm.run_code_string(scope.clone(), &command, "<stdin>".to_owned()) | ||
| .map(drop) |
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Is this a common convention to drop value from Result? It looks like drop is important logic here to me. If not, a weak suggestion.
| .map(drop) | |
| .map(|_| ()) |
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I've seen .map(drop) a decent amount, yeah.
| env::var_os(name).filter(|v| !v.is_empty()).map(|value| { | ||
| value | ||
| .to_str() | ||
| .and_then(|v| v.parse::<u8>().ok()) | ||
| .unwrap_or(1) | ||
| }) |
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| env::var_os(name).filter(|v| !v.is_empty()).map(|value| { | |
| value | |
| .to_str() | |
| .and_then(|v| v.parse::<u8>().ok()) | |
| .unwrap_or(1) | |
| }) | |
| let value_str = env::var_os(name).filter(|v| !v.is_empty())?; | |
| let value = value_str | |
| .to_str() | |
| .and_then(|v| v.parse::<u8>().ok()) | |
| .unwrap_or(1); | |
| Some(value) |
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Given there's 2 layers of Option here, I think I'd like to keep the logic as it is - looking at the suggested version my instinct was to change it to .to_str()?.parse().unwrap_or(1), but that's different. I think the explicit map() makes more clear the control flow and conditions.
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line 349 and the following lines are unrelated logics. early return reveals line 350 is independent to 349 and code readers can forget about 349 when going to 350.
Using map make readers essentially follow the full logic without benefit.
Part of this is taken from #5414.