Makes a list of existing constants deprecated.
Returns an UnboundMethod representing the given instance method in mod.
class Interpreter def do_a() print "there, "; end def do_d() print "Hello "; end def do_e() print "!\n"; end def do_v() print "Dave"; end Dispatcher = { "a" => instance_method(:do_a), "d" => instance_method(:do_d), "e" => instance_method(:do_e), "v" => instance_method(:do_v) } def interpret(string) string.each_char {|b| Dispatcher[b].bind(self).call } end end interpreter = Interpreter.new interpreter.interpret('dave')
produces:
Hello there, Dave!
Evaluates the string or block in the context of mod, except that when a block is given, constant/class variable lookup is not affected. This can be used to add methods to a class. module_eval returns the result of evaluating its argument. The optional filename and lineno parameters set the text for error messages.
class Thing end a = %q{def hello() "Hello there!" end} Thing.module_eval(a) puts Thing.new.hello() Thing.module_eval("invalid code", "dummy", 123)
produces:
Hello there!
dummy:123:in `module_eval': undefined local variable
or method `code' for Thing:Class
Evaluates the string or block in the context of mod, except that when a block is given, constant/class variable lookup is not affected. This can be used to add methods to a class. module_eval returns the result of evaluating its argument. The optional filename and lineno parameters set the text for error messages.
class Thing end a = %q{def hello() "Hello there!" end} Thing.module_eval(a) puts Thing.new.hello() Thing.module_eval("invalid code", "dummy", 123)
produces:
Hello there!
dummy:123:in `module_eval': undefined local variable
or method `code' for Thing:Class
Makes new_name a new copy of the method old_name. This can be used to retain access to methods that are overridden.
module Mod alias_method :orig_exit, :exit def exit(code=0) puts "Exiting with code #{code}" orig_exit(code) end end include Mod exit(99)
produces:
Exiting with code 99
Just returns true. It’s nonsense, but is for symmetry.
Date.valid_jd?(2451944) #=> true
See also ::jd.
Returns true if the given calendar date is valid, and false if not.
Date.valid_date?(2001,2,3) #=> true Date.valid_date?(2001,2,29) #=> false
Returns true if the given calendar date is valid, and false if not.
Date.valid_date?(2001,2,3) #=> true Date.valid_date?(2001,2,29) #=> false
Duplicates self and resets its day of calendar reform.
d = Date.new(1582,10,15) d.new_start(Date::JULIAN) #=> #<Date: 1582-10-05 ...>
Returns an array containing the values associated with the given keys.
Calls the block once for each value string in the database. Returns self.
Returns true if the database contains the specified string value, false otherwise.
Returns the struct member values for each selector as an Array. A selector may be either an Integer offset or a Range of offsets (as in Array#values_at).
Customer = Struct.new(:name, :address, :zip) joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345) joe.values_at(0, 2) #=> ["Joe Smith", 12345]
Waits until IO is writable without blocking and returns self or nil when times out.
Returns the Encoding object that represents the encoding of the file. If io is in write mode and no encoding is specified, returns nil.
Returns the Encoding of the internal string if conversion is specified. Otherwise returns nil.
Returns an array of the values associated with each specified key.
Executes block for each key in the database, passing the corresponding value as a parameter.
Returns true if the given value v exists within the database. Returns false otherwise.
Provides marshalling support for use by the Marshal library.
Provides marshalling support for use by the Marshal library.
Returns true if this class can be used to create an instance from a serialised JSON string. The class has to implement a class method json_create that expects a hash as first parameter. The hash should include the required data.