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Davichet-e/grouping-by.rs Secret

Created August 18, 2020 20:52
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A small example of grouping-by crate.
Raw
grouping-by.rs
// This returns for each year, the contract with the most days.
contracts.iter().grouping_by_max(
|contract| contract.date.year(), // Key of HashMap
|contract1, contract2| contract1.days.cmp(&contract2.days), // Comparator to get the max
) // Returns `HashMap<i32, Contract>`
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