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.



4689
4690
4691
 
# File 'lib/source/ruby.rb', line 4689

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

Instance Method Details

#== ⇒ Object

FIX: Incomplete



4694
4695
 
# File 'lib/source/ruby.rb', line 4694

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



4710
4711
4712
 
# File 'lib/source/ruby.rb', line 4710

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

#arity ⇒ Object

FIX: Incomplete



4715
4716
 
# File 'lib/source/ruby.rb', line 4715

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



4732
4733
4734
 
# File 'lib/source/ruby.rb', line 4732

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.



4742
4743
4744
 
# File 'lib/source/ruby.rb', line 4742

def to_proc
  return self
end