Class: Proc

Inherits:
Object show all
Defined in:
lib/reactive_extensions/proc/errors.rb

Overview

This file adds the #raises_error? method to a Proc object. This method checks whether the proc raises an error when called with the given parameters.

Ruby’s core Proc class. See documentation for version 2.1.5, 2.0.0, or 1.9.3.

Instance Method Summary collapse

Instance Method Details

#raises_error?(*args) ⇒ Boolean

The #raises_error? method checks whether an exception is raised when the calling Proc is called with the given *args.

The #raises_error? method does not actually create lasting changes to objects or variables; it only checks whether an exception would be raised if the Proc were called with the given *args.

Basic examples:

proc = Proc.new {|q| 1.quo(q) }
proc.raises_error?(2)       # => false
proc.raises_error?(0)       # => true

Examples with destructive proc:

hash = {:foo => :bar}
proc = Proc.new {|hash| hash.reject! {|k,v| k === :foo } }
proc.raises_error?(hash)    # => false
hash                        # => {:foo => :bar}

Returns:

  • (Boolean) 


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# File 'lib/reactive_extensions/proc/errors.rb', line 32

def raises_error?(*args)
  (!self.call(*args.deep_dup)) rescue true
end