Class: Proc

Inherits:
Object show all
Defined in:
lib/source/ruby.rb

Overview

Proc objects are blocks of code that have been bound to a set of local variables. Once bound, the code may be called in different contexts and still access those variables.

def gen_times(factor)
  return Proc.new {|n| n * factor }
end

times3 = gen_times(3)
times5 = gen_times(5)

times3.call(12)               #=> 36
times5.call(5)                #=> 25
times3.call(times5.call(4))   #=> 60

Instance Method Summary collapse

Constructor Details

#initialize(func) ⇒ Proc

call-seq:

Proc.new {|...| block } -> proc

Creates a new Proc object, bound to the current context.



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# File 'lib/source/ruby.rb', line 4676

def initialize(func)
  `this._block=func`
end

Instance Method Details

#== ⇒ Object

FIX: Incomplete



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# File 'lib/source/ruby.rb', line 4681

def ==
end

#[] ⇒ Object

call-seq:

prc.call(params, ...) -> obj
prc[params, ...]      -> obj

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.

proc = Proc.new {|x| x * 100 }

proc[4]   #=> 400



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# File 'lib/source/ruby.rb', line 4697

def []()
  `this._block.apply(this,arguments)`
end

#arity ⇒ Object

FIX: Incomplete



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# File 'lib/source/ruby.rb', line 4702

def arity
end

#call ⇒ Object

call-seq:

prc.call(params, ...) -> obj
prc[params, ...]      -> obj

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. See also Proc#yield.

proc = Proc.new {|x| x * 100 }

proc.call(4)    #=> 400



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# File 'lib/source/ruby.rb', line 4719

def call
  `this._block.apply(this,arguments)`
end

#to_proc ⇒ Object

call-seq:

proc.to_proc -> proc

Part of the protocol for converting objects to Proc objects. Instances of class Proc simply return themselves.



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# File 'lib/source/ruby.rb', line 4729

def to_proc
  return self
end