Ruby’s pitfalls
grammar :
The function of trap::()
trap::difference with or without spaces
Effects of trap::
trap::scope, control structure
trap::type conversion
trap::destructive method
trap::Method call with block
trap::parameters
trap::boolean
trap::implied$_
Inner class :
trap::Array
trap::Dir
trap::File
trap::Hash
trap::IO
trap::Numeric
trap::Process
trap::Regexp
trap::String
trap::Thread
trap::Time
trap::NilClass
Library :
trap::timeout
trap::Socket
trap::matrix
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