Waits for all children, returns an array of 2-element arrays; each subarray contains the integer pid and Process::Status status for one of the reaped child processes:
pid0 = Process.spawn('ruby', '-e', 'exit 13') # => 325470 pid1 = Process.spawn('ruby', '-e', 'exit 14') # => 325495 Process.waitall # => [[325470, #<Process::Status: pid 325470 exit 13>], [325495, #<Process::Status: pid 325495 exit 14>]]
Adds a post-install hook that will be passed an Gem::Installer instance when Gem::Installer#install is called
Adds a post-installs hook that will be passed a Gem::DependencyInstaller and a list of installed specifications when Gem::DependencyInstaller#install is complete
Adds a post-uninstall hook that will be passed a Gem::Uninstaller instance and the spec that was uninstalled when Gem::Uninstaller#uninstall is called
Adds a pre-install hook that will be passed an Gem::Installer instance when Gem::Installer#install is called. If the hook returns false then the install will be aborted.
Adds a pre-uninstall hook that will be passed an Gem::Uninstaller instance and the spec that will be uninstalled when Gem::Uninstaller#uninstall is called
Installs the gem dep_or_name and all its dependencies. Returns an Array of installed gem specifications.
If the :prerelease option is set and there is a prerelease for dep_or_name the prerelease version will be installed.
Unless explicitly specified as a prerelease dependency, prerelease gems that dep_or_name depend on will not be installed.
If c-1.a depends on b-1 and a-1.a and there is a gem b-1.a available then c-1.a, b-1 and a-1.a will be installed. b-1.a will need to be installed separately.
Installs the gem and returns a loaded Gem::Specification for the installed gem.
The gem will be installed with the following structure:
@gem_home/ cache/<gem-version>.gem #=> a cached copy of the installed gem gems/<gem-version>/... #=> extracted files specifications/<gem-version>.gemspec #=> the Gem::Specification
Installs gems for this RequestSet using the Gem::Installer options.
If a block is given an activation request and installer are yielded. The installer will be nil if a gem matching the request was already installed.
Performs the uninstall of the gem. This removes the spec, the Gem directory, and the cached .gem file.
Check if gem name version version is installed.
Returns whether for every element of self, a given criterion is satisfied.
With no block and no argument, returns whether every element of self is truthy:
[[], {}, '', 0, 0.0, Object.new].all? # => true # All truthy objects.
[[], {}, '', 0, 0.0, nil].all? # => false # nil is not truthy.
[[], {}, '', 0, 0.0, false].all? # => false # false is not truthy.
With argument object given, returns whether object === ele for every element ele in self:
[0, 0, 0].all?(0) # => true [0, 1, 2].all?(1) # => false ['food', 'fool', 'foot'].all?(/foo/) # => true ['food', 'drink'].all?(/foo/) # => false
With a block given, calls the block with each element in self; returns whether the block returns only truthy values:
[0, 1, 2].all? { |ele| ele < 3 } # => true [0, 1, 2].all? { |ele| ele < 2 } # => false
With both a block and argument object given, ignores the block and uses object as above.
Special case: returns true if self is empty (regardless of any given argument or block).
Related: Enumerable#all?
Returns true if all bits that are set (=1) in mask are also set in self; returns false otherwise.
Example values:
0b1010101 self
0b1010100 mask
0b1010100 self & mask
true self.allbits?(mask)
0b1010100 self
0b1010101 mask
0b1010100 self & mask
false self.allbits?(mask)
Related: Integer#anybits?, Integer#nobits?.
Returns a string containing the characters in self; the first character is upcased; the remaining characters are downcased:
s = 'hello World!' # => "hello World!" s.capitalize # => "Hello world!"
The casing may be affected by the given options; see Case Mapping.
Related: String#capitalize!.
Upcases the first character in self; downcases the remaining characters; returns self if any changes were made, nil otherwise:
s = 'hello World!' # => "hello World!" s.capitalize! # => "Hello world!" s # => "Hello world!" s.capitalize! # => nil
The casing may be affected by the given options; see Case Mapping.
Related: String#capitalize.
Invokes the continuation. The program continues from the end of the callcc block. If no arguments are given, the original callcc returns nil. If one argument is given, callcc returns it. Otherwise, an array containing args is returned.
callcc {|cont| cont.call } #=> nil callcc {|cont| cont.call 1 } #=> 1 callcc {|cont| cont.call 1, 2, 3 } #=> [1, 2, 3]
Allocates space for a new object of class’s class and does not call initialize on the new instance. The returned object must be an instance of class.
klass = Class.new do def initialize(*args) @initialized = true end def initialized? @initialized || false end end klass.allocate.initialized? #=> false
Returns true if the log level allows entries with severity Logger::FATAL to be written, false otherwise. See Log Level.
Sets the log level to Logger::FATAL. See Log Level.
Equivalent to calling add with severity Logger::FATAL.
Invokes the block, setting the block’s parameters to the values in params using something close to method calling semantics. Returns the value of the last expression evaluated in the block.
a_proc = Proc.new {|scalar, *values| values.map {|value| value*scalar } } a_proc.call(9, 1, 2, 3) #=> [9, 18, 27] a_proc[9, 1, 2, 3] #=> [9, 18, 27] a_proc.(9, 1, 2, 3) #=> [9, 18, 27] a_proc.yield(9, 1, 2, 3) #=> [9, 18, 27]
Note that prc.() invokes prc.call() with the parameters given. It’s syntactic sugar to hide “call”.
For procs created using lambda or ->() an error is generated if the wrong number of parameters are passed to the proc. For procs created using Proc.new or Kernel.proc, extra parameters are silently discarded and missing parameters are set to nil.
a_proc = proc {|a,b| [a,b] } a_proc.call(1) #=> [1, nil] a_proc = lambda {|a,b| [a,b] } a_proc.call(1) # ArgumentError: wrong number of arguments (given 1, expected 2)
See also Proc#lambda?.
Invokes the meth with the specified arguments, returning the method’s return value.
m = 12.method("+") m.call(3) #=> 15 m.call(20) #=> 32
Generates a Continuation object, which it passes to the associated block. You need to require 'continuation' before using this method. Performing a cont.call will cause the callcc to return (as will falling through the end of the block). The value returned by the callcc is the value of the block, or the value passed to cont.call. See class Continuation for more details. Also see Kernel#throw for an alternative mechanism for unwinding a call stack.