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015 Advanced #fetch
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How to use the Twitter API with Ruby (Ruby Twitter API Tutorial)
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012 #fetch for Defaults
A Better Way to Query Hash Values in Ruby
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Ruby for All | Favorite Ruby Methods: Part 2 - The Hash
Interesting Methods to Work with Ruby Hashes in A Better Way
Hash#fetch with second argument is slower than Hash#fetch with block is not FAIR · Issue #117 · fastruby/fast-ruby · GitHub
Contradiction in examples of Hash#fetch · Issue #351 · rubocop/ruby-style-guide · GitHub
Ruby Hash#fetch() - Scaler Topics
Ruby入門】Hash(ハッシュ)の使い方 (each fetch find select) | 侍エンジニアブログ
Understanding default values in Ruby hashes | by Winshen Liu | Medium
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Ruby Quick Tip - Use Deep Fetch for Nested Hash Values
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Working with Hashes in Ruby | Culttt
