42 lines
1.1 KiB
Ruby
42 lines
1.1 KiB
Ruby
# typed: strict
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# frozen_string_literal: true
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class Hash
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# Returns a new hash with `self` and `other_hash` merged recursively.
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#
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# ### Examples
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#
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# ```ruby
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# h1 = { a: true, b: { c: [1, 2, 3] } }
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# h2 = { a: false, b: { x: [3, 4, 5] } }
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#
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# h1.deep_merge(h2) # => { a: false, b: { c: [1, 2, 3], x: [3, 4, 5] } }
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# ```
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#
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# Like with Hash#merge in the standard library, a block can be provided
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# to merge values:
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#
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# ```ruby
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# h1 = { a: 100, b: 200, c: { c1: 100 } }
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# h2 = { b: 250, c: { c1: 200 } }
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# h1.deep_merge(h2) { |key, this_val, other_val| this_val + other_val }
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# # => { a: 100, b: 450, c: { c1: 300 } }
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# ```
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def deep_merge(other_hash, &block)
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dup.deep_merge!(other_hash, &block)
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end
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# Same as {#deep_merge}, but modifies `self`.
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def deep_merge!(other_hash, &block)
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merge!(other_hash) do |key, this_val, other_val|
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if T.unsafe(this_val).is_a?(Hash) && other_val.is_a?(Hash)
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T.unsafe(this_val).deep_merge(other_val, &block)
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elsif block
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yield(key, this_val, other_val)
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else
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other_val
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end
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end
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end
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end
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