Module: Kernel

Defined in:
lib/core_ext/kernel/concern.rb,
lib/core_ext/kernel/reporting.rb,
lib/core_ext/kernel/singleton_class.rb

Instance Method Summary collapse

Instance Method Details

#class_eval(*args, &block) ⇒ Object

class_eval on an object acts like singleton_class.class_eval.



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# File 'lib/core_ext/kernel/singleton_class.rb', line 3

def class_eval(*args, &block)
  singleton_class.class_eval(*args, &block)
end

#concern(topic, &module_definition) ⇒ Object

A shortcut to define a toplevel concern, not within a module.

See Module::Concerning for more.



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# File 'lib/core_ext/kernel/concern.rb', line 7

def concern(topic, &module_definition)
  Object.concern topic, &module_definition
end

#enable_warnings ⇒ Object

Sets $VERBOSE to true for the duration of the block and back to its original value afterwards.



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# File 'lib/core_ext/kernel/reporting.rb', line 16

def enable_warnings
  with_warnings(true) { yield }
end

#silence_warnings ⇒ Object

Sets $VERBOSE to nil for the duration of the block and back to its original value afterwards.

silence_warnings do
  value = noisy_call # no warning voiced
end

noisy_call # warning voiced



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# File 'lib/core_ext/kernel/reporting.rb', line 10

def silence_warnings
  with_warnings(nil) { yield }
end

#suppress(*exception_classes) ⇒ Object

Blocks and ignores any exception passed as argument if raised within the block.

suppress(ZeroDivisionError) do
  1/0
  puts 'This code is NOT reached'
end

puts 'This code gets executed and nothing related to ZeroDivisionError was seen'



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# File 'lib/core_ext/kernel/reporting.rb', line 37

def suppress(*exception_classes)
  yield
rescue *exception_classes
end

#with_warnings(flag) ⇒ Object

Sets $VERBOSE for the duration of the block and back to its original value afterwards.



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# File 'lib/core_ext/kernel/reporting.rb', line 22

def with_warnings(flag)
  old_verbose, $VERBOSE = $VERBOSE, flag
  yield
ensure
  $VERBOSE = old_verbose
end