In Ruby, a code block (or just "Block") is an object that contains some Ruby code, and the context necessary to execute it. Code blocks are the most visually distinctive aspect of Ruby, and also one of the most confusing to newcomers from other languages. Essentially, a Ruby code block is a method that has no name. Most other languages have something like a Ruby code block: C's function pointers, C++'s function objects, Python's lambdas and list comprehensions, Perl's anonymous functions, Java's anonymous inner classes. These features live mostly in the corners of those languages, shunned by novice programmers. Ruby can't be written without code blocks. Of the major languages, only Lisp is more block-oriented.
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