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 4728

def initialize(func)
  `this.__block__=func`
  `this.__block__.__id__=func.__id__||Red.id++`
  `this.__id__=this.__block__.__id__`
end

Instance Method Details

#==(other) ⇒ Object

call-seq:

prc == other => true or false

Returns true if prc and other are the same object, false otherwise.



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# File 'lib/source/ruby.rb', line 4740

def ==(other)
  `this.__id__==other.__id__`
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 4757

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

#arity ⇒ Object

FIX: Incomplete



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# File 'lib/source/ruby.rb', line 4762

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 4779

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 4789

def to_proc
  return self
end