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Contents
# TITLE:
#
# Hash Deletion Extensions
#
# SUMMARY:
#
# General manipulation extensions for Hash class.
#
# CREDITS:
#
# - Daniel Schierbeck
# - Thomas Sawyer
#
class Hash
alias_method :delete_at, :delete
# CREDIT Daniel Schierbeck
def delete_unless #:yield:
delete_if{ |key, value| ! yield(key, value) }
end
# CREDIT Daniel Schierbeck
# Minor modification to Ruby's Hash#delete method
# allowing it to take multiple keys.
#
# hsh = { :a => 1, :b => 2 }
# hsh.delete_values(1)
# hsh #=> { :b => 2 }
def delete_values(*values)
keys.map{ |key| delete(key) if values.include?(fetch(key)) }
end
# CREDIT Daniel Schierbeck
# Minor modification to Ruby's Hash#delete method
# allowing it to take multiple keys.
#
# This works niely with hash#[] and Hash#[]= facets.
#
# hsh[:a, :b, :c] = 1, 2, 3
#
# a, b, c = hsh.delete_values_at(:a, :b, :c)
#
# [a, b, c] #=> [1, 2, 3]
# hsh #=> {}
def delete_values_at(*keys, &yld)
keys.map{|key| delete(key, &yld) }
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TestHashDelete < Test::Unit::TestCase
def test_delete_unless
a = { :a => 1, :b => 2, :c => 3 }
e = { :a => 1 }
r = a.delete_unless{|k,v| v == 1}
assert_equal( e, a )
end
def test_delete_values
a = { :a => 1, :b => 2, :c => 3 }
e = { :b => 2, :c => 3 }
r = a.delete_values(1)
assert_equal( e, a )
end
def test_delete_values_at
a = { :a => 1, :b => 2, :c => 3 }
e = { :b => 2, :c => 3 }
r = a.delete_values_at(:a)
assert_equal( e, a )
end
end
=end
Version data entries
10 entries across 10 versions & 1 rubygems