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Playing with Sorbet
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What
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Sorbet is a fast, powerful type checker designed for Ruby.
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Why
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Once upon a time
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We expose a public API
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Expecting params = { user: { first_name: "Luciano", last_name: "Sousa" } }
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We got a
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params = { user: "a" }
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TypeError (no implicit conversion of Symbol into Integer)
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NoMethodError (undefined method `where' for nil:NilClass)
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Let’s talk about Java
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Let’s talk about dynamic vs static typed languages
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• •
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• • •
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String javaString = new String(“I am a Java string”) ruby_string = “I am a Ruby string”
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Dynamic languages
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Ruby
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Examples
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begin do_something rescue StandardErro do_something_else end
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Tests
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Let's talk about Shopify
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~1500 devs
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~40 deploys/day
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~5 million req/min
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~83k req/sec ~170k req/sec peak
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Sorbet at Shopify
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~36 issues fixed
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~17 dead code never hit
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~16 name error
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~3 wrong args
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Maybe some millions
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Examples
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“I hate type annotations.”
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class UserHelper def name_length(name) name.length end end
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# typed: true class UserHelper def name_length(name) name.length end end
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# typed: true class UserHelper extend T::Sig def name_length(name) name.length end end
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# typed: true class UserHelper extend T::Sig sig { params(name: String).returns(Integer) } def name_length(name) name.length end end
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How it works
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Disclaimer
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# typed: true
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extend T::Sig
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sig { params(name: String).returns(Integer) }
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sig { params(name: String).returns(Integer) }
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Resources •
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Resources •
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Resources •
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Resources •
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Thanks!