Equivalent to Set#keep_if, but returns nil if no changes were made. Returns an enumerator if no block is given.
Equivalent to Set#select!
Merges the elements of the given enumerable object to the set and returns self.
Resets the internal state after modification to existing elements and returns self.
Elements will be reindexed and deduplicated.
In general, to_sym returns the Symbol corresponding to an object. As sym is already a symbol, self is returned in this case.
Case-insensitive version of Symbol#<=>. Currently, case-insensitivity only works on characters A-Z/a-z, not all of Unicode. This is different from Symbol#casecmp?.
:aBcDeF.casecmp(:abcde) #=> 1 :aBcDeF.casecmp(:abcdef) #=> 0 :aBcDeF.casecmp(:abcdefg) #=> -1 :abcdef.casecmp(:ABCDEF) #=> 0
nil is returned if the two symbols have incompatible encodings, or if other_symbol is not a symbol.
:foo.casecmp(2) #=> nil "\u{e4 f6 fc}".encode("ISO-8859-1").to_sym.casecmp(:"\u{c4 d6 dc}") #=> nil
Returns true if sym and other_symbol are equal after Unicode case folding, false if they are not equal.
:aBcDeF.casecmp?(:abcde) #=> false :aBcDeF.casecmp?(:abcdef) #=> true :aBcDeF.casecmp?(:abcdefg) #=> false :abcdef.casecmp?(:ABCDEF) #=> true :"\u{e4 f6 fc}".casecmp?(:"\u{c4 d6 dc}") #=> true
nil is returned if the two symbols have incompatible encodings, or if other_symbol is not a symbol.
:foo.casecmp?(2) #=> nil "\u{e4 f6 fc}".encode("ISO-8859-1").to_sym.casecmp?(:"\u{c4 d6 dc}") #=> nil
Returns whether sym is :“” or not.
Same as sym.to_s.upcase.intern.
Same as sym.to_s.downcase.intern.
Same as sym.to_s.swapcase.intern.
Callback invoked whenever a subclass of the current class is created.
Example:
class Foo def self.inherited(subclass) puts "New subclass: #{subclass}" end end class Bar < Foo end class Baz < Bar end
produces:
New subclass: Bar New subclass: Baz
Returns the superclass of class, or nil.
File.superclass #=> IO IO.superclass #=> Object Object.superclass #=> BasicObject class Foo; end class Bar < Foo; end Bar.superclass #=> Foo
Returns nil when the given class does not have a parent class:
BasicObject.superclass #=> nil
The opposite of Pathname#absolute?
It returns false if the pathname begins with a slash.
p = Pathname.new('/im/sure') p.relative? #=> false p = Pathname.new('not/so/sure') p.relative? #=> true
Creates a full path, including any intermediate directories that don’t yet exist.
See FileUtils.mkpath and FileUtils.mkdir_p
Returns the real (absolute) pathname for self in the actual filesystem.
Does not contain symlinks or useless dots, .. and ..
All components of the pathname must exist when this method is called.
Returns the real (absolute) pathname of self in the actual filesystem.
Does not contain symlinks or useless dots, .. and ..
The last component of the real pathname can be nonexistent.
Returns the birth time for the file. If the platform doesn’t have birthtime, raises NotImplementedError.
See File.birthtime.
Returns the last change time, using directory information, not the file itself.
See File.ctime.