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Contents
describe "Hash#select" do
before(:each) do
@hsh = {1 => 2, 3 => 4, 5 => 6}
@empty = {}
end
it "yields two arguments: key and value" do
all_args = []
{1 => 2, 3 => 4}.select { |*args| all_args << args }
all_args.should == [[1, 2], [3, 4]]
end
it "returns a Hash of entries for which block is true" do
a_pairs = {'a' => 9, 'c' => 4, 'b' => 5, 'd' => 2}.select { |k,v| v % 2 == 0 }
a_pairs.should be_kind_of(Hash)
a_pairs.should == {'c' => 4, 'd' => 2}
end
it "processes entries with the same order as reject" do
h = {:a => 9, :c => 4, :b => 5, :d => 2}
select_pairs = []
reject_pairs = []
h.select { |*pair| select_pairs << pair }
h.reject { |*pair| reject_pairs << pair }
select_pairs.should == reject_pairs
end
end
describe "Hash#select!" do
before(:each) do
@hsh = {1 => 2, 3 => 4, 5 => 6}
@empty = {}
end
it "is equivalent to keep_if if changes are made" do
{:a => 2}.select! { |k,v| v <= 1 }.should ==
{:a => 2}.keep_if { |k, v| v <= 1 }
h = {1 => 2, 3 => 4}
all_args_select = []
all_args_keep_if = []
h.dup.select! { |*args| all_args_select << args }
h.dup.keep_if { |*args| all_args_keep_if << args }
all_args_select.should == all_args_keep_if
end
it "returns nil if no changes were made" do
{:a => 1}.select! { |k,v| v <= 1 }.should == nil
end
end
Version data entries
29 entries across 29 versions & 1 rubygems