A
access private protected public accessor method ActiveSupport library additive change to core functionality pass-through hybrid change alias keyword, 2nd alias_method method ancestors method and-equals operator anonymous function, basic archdir ARGF.class object argument list ArgumentError, 2nd, 3rd ArgumentList class arguments, 2nd and reference assignment to variable default value defined, 2nd list, rules for optional order required syntax arithmetic expression arithmetic method arithmetic operation arithmetic operators - / % + actually methods calling as a method syntactic sugar arity Array class implementing map_with_index in literal constructor new method Array method Array.new method Array#size method arrays, ...
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