option_combinator.rs

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option_combinator.rs

async_task.rs

arc_mutex.rs

trait_impl.rs

macro_pattern.rs

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option_combinator.rs

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fn get_config(key: &str) -> Option<String> {↵

env::var(key).ok()↵

.or_else(|| read_file(key).ok())↵

.filter(|s| !s.is_empty())↵

.map(|s| s.trim().to_owned())↵

}

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관련 연습 문제

async_task.rs arc_mutex.rs trait_impl.rs macro_pattern.rs