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Optimize Hash#transform_{keys,values} #14502

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merged 3 commits into from
Sep 2, 2024
Merged

Optimize Hash#transform_{keys,values} #14502

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f6b03c8
Optimize Hash#transform_{keys,values}
jgaskins Apr 17, 2024
8601403
Reduce conditional to just the hash size
jgaskins Aug 25, 2024
20d5297
Allocate new hash with entries_capacity
jgaskins Aug 25, 2024
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6 changes: 4 additions & 2 deletions src/hash.cr
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Original file line number Diff line number Diff line change
Expand Up @@ -1747,7 +1747,8 @@ class Hash(K, V)
# hash.transform_keys { |key, value| key.to_s * value } # => {"a" => 1, "bb" => 2, "ccc" => 3}
# ```
def transform_keys(& : K, V -> K2) : Hash(K2, V) forall K2
each_with_object({} of K2 => V) do |(key, value), memo|
copy = Hash(K2, V).new(initial_capacity: entries_capacity)
each_with_object(copy) do |(key, value), memo|
memo[yield(key, value)] = value
end
end
Expand All @@ -1762,7 +1763,8 @@ class Hash(K, V)
# hash.transform_values { |value, key| "#{key}#{value}" } # => {:a => "a1", :b => "b2", :c => "c3"}
# ```
def transform_values(& : V, K -> V2) : Hash(K, V2) forall V2
each_with_object({} of K => V2) do |(key, value), memo|
copy = Hash(K, V2).new(initial_capacity: entries_capacity)
each_with_object(copy) do |(key, value), memo|
memo[key] = yield(value, key)
end
end
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