Returns a pretty printed object as a string.
In order to use this method you must first require the PP module:
require 'pp'
See the PP module for more information.
Returns the names of the current local variables.
fred = 1 for i in 1..10 # ... end local_variables #=> [:fred, :i]
Returns an array containing elements selected by the block.
With a block given, calls the block with successive elements; returns an array of those elements for which the block returns a truthy value:
(0..9).select {|element| element % 3 == 0 } # => [0, 3, 6, 9] a = {foo: 0, bar: 1, baz: 2}.select {|key, value| key.start_with?('b') } a # => {:bar=>1, :baz=>2}
With no block given, returns an Enumerator.
Related: reject.
Returns the elements for which the block returns the minimum values.
With a block given and no argument, returns the element for which the block returns the minimum value:
(1..4).min_by {|element| -element } # => 4 %w[a b c d].min_by {|element| -element.ord } # => "d" {foo: 0, bar: 1, baz: 2}.min_by {|key, value| -value } # => [:baz, 2] [].min_by {|element| -element } # => nil
With a block given and positive integer argument n given, returns an array containing the n elements for which the block returns minimum values:
(1..4).min_by(2) {|element| -element } # => [4, 3] %w[a b c d].min_by(2) {|element| -element.ord } # => ["d", "c"] {foo: 0, bar: 1, baz: 2}.min_by(2) {|key, value| -value } # => [[:baz, 2], [:bar, 1]] [].min_by(2) {|element| -element } # => []
Returns an Enumerator if no block is given.
Returns a 2-element array containing the elements for which the block returns minimum and maximum values:
(1..4).minmax_by {|element| -element } # => [4, 1] %w[a b c d].minmax_by {|element| -element.ord } # => ["d", "a"] {foo: 0, bar: 1, baz: 2}.minmax_by {|key, value| -value } # => [[:baz, 2], [:foo, 0]] [].minmax_by {|element| -element } # => [nil, nil]
Returns an Enumerator if no block is given.
Calls the given block with each element, converting multiple values from yield to an array; returns self:
a = [] (1..4).each_entry {|element| a.push(element) } # => 1..4 a # => [1, 2, 3, 4] a = [] h = {foo: 0, bar: 1, baz:2} h.each_entry {|element| a.push(element) } # => {:foo=>0, :bar=>1, :baz=>2} a # => [[:foo, 0], [:bar, 1], [:baz, 2]] class Foo include Enumerable def each yield 1 yield 1, 2 yield end end Foo.new.each_entry {|yielded| p yielded }
Output:
1 [1, 2] nil
With no block given, returns an Enumerator.
Returns the last Error of the current executing Thread or nil if none
Sets the last Error of the current executing Thread to error
Arguments obj and opts here are the same as arguments obj and opts in JSON.generate.
By default, generates JSON data without checking for circular references in obj (option max_nesting set to false, disabled).
Raises an exception if obj contains circular references:
a = []; b = []; a.push(b); b.push(a) # Raises SystemStackError (stack level too deep): JSON.fast_generate(a)
Initializes the MonitorMixin after being included in a class or when an object has been extended with the MonitorMixin
Returns the original line from source for from the given object.
See ::trace_object_allocations for more information and examples.
Returns the full line that is being edited. This is useful from within the complete_proc for determining the context of the completion request.
The length of Readline.line_buffer and GNU Readline’s rl_end are same.
Raises NotImplementedError if the using readline library does not support.
Clear the current input line.
Insert text into the line at the current cursor position.
See GNU Readline’s rl_insert_text function.
Raises NotImplementedError if the using readline library does not support.
Combine two Adler-32 check values in to one. adler1 is the first Adler-32 value, adler2 is the second Adler-32 value. len2 is the length of the string used to generate adler2.
Combine two CRC-32 check values in to one. crc1 is the first CRC-32 value, crc2 is the second CRC-32 value. len2 is the length of the string used to generate crc2.
Returns true if the named file is writable by the real user and group id of this process. See access(3).
Note that some OS-level security features may cause this to return true even though the file is not writable by the real user/group.
If file_name is writable by others, returns an integer representing the file permission bits of file_name. Returns nil otherwise. The meaning of the bits is platform dependent; on Unix systems, see stat(2).
file_name can be an IO object.
File.world_writable?("/tmp") #=> 511 m = File.world_writable?("/tmp") sprintf("%o", m) #=> "777"
Returns information for memory pools in the GC.
If the first optional argument, heap_name, is passed in and not nil, it returns a Hash containing information about the particular memory pool. Otherwise, it will return a Hash with memory pool names as keys and a Hash containing information about the memory pool as values.
If the second optional argument, hash_or_key, is given as Hash, it will be overwritten and returned. This is intended to avoid the probe effect.
If both optional arguments are passed in and the second optional argument is a symbol, it will return a Numeric of the value for the particular memory pool.
On CRuby, heap_name is of the type Integer but may be of type String on other implementations.
The contents of the hash are implementation specific and may change in the future without notice.
If the optional argument, hash, is given, it is overwritten and returned.
This method is only expected to work on CRuby.
Start a dRuby server locally.
The new dRuby server will become the primary server, even if another server is currently the primary server.
uri is the URI for the server to bind to. If nil, the server will bind to random port on the default local host name and use the default dRuby protocol.
front is the server’s front object. This may be nil.
config is the configuration for the new server. This may be nil.
See DRbServer::new.
Start a dRuby server locally.
The new dRuby server will become the primary server, even if another server is currently the primary server.
uri is the URI for the server to bind to. If nil, the server will bind to random port on the default local host name and use the default dRuby protocol.
front is the server’s front object. This may be nil.
config is the configuration for the new server. This may be nil.
See DRbServer::new.
Stop the local dRuby server.
This operates on the primary server. If there is no primary server currently running, it is a noop.
Stop the local dRuby server.
This operates on the primary server. If there is no primary server currently running, it is a noop.
Registers server with DRb.
This is called when a new DRb::DRbServer is created.
If there is no primary server then server becomes the primary server.
Example:
require 'drb' s = DRb::DRbServer.new # automatically calls regist_server DRb.fetch_server s.uri #=> #<DRb::DRbServer:0x...>
Registers server with DRb.
This is called when a new DRb::DRbServer is created.
If there is no primary server then server becomes the primary server.
Example:
require 'drb' s = DRb::DRbServer.new # automatically calls regist_server DRb.fetch_server s.uri #=> #<DRb::DRbServer:0x...>