That return statement will stop the execution of each and return from find_mod_2. If this was another language, or if each was implemented with a Proc rather than a yield, you would have to return a special value to indicate you wanted to stop, or raise an exception. This is how Crystal gets away with having no for loop in the language.4 Otherwise the block would simply cede control to the method that called it.
Kaniko is a build tool that runs in Kubernetes and produces container images from Dockerfiles; it’s pretty neat because it runs completely in user space, i.e. does not require admin permissions.
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Basics: Identification vs. Decoding vs. Reconstruction
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