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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
require_relative 'shared/iteration'
require_relative '../enumerable/shared/enumeratorized'
describe "Hash#reject" do
it "returns a new hash removing keys for which the block yields true" do
h = { 1=>false, 2=>true, 3=>false, 4=>true }
h.reject { |k,v| v }.keys.sort.should == [1,3]
end
it "is equivalent to hsh.dup.delete_if" do
h = { a: 'a', b: 'b', c: 'd' }
h.reject { |k,v| k == 'd' }.should == (h.dup.delete_if { |k, v| k == 'd' })
all_args_reject = []
all_args_delete_if = []
h = { 1 => 2, 3 => 4 }
h.reject { |*args| all_args_reject << args }
h.delete_if { |*args| all_args_delete_if << args }
all_args_reject.should == all_args_delete_if
h = { 1 => 2 }
# dup doesn't copy singleton methods
def h.to_a() end
h.reject { false }.to_a.should == [[1, 2]]
end
context "with extra state" do
it "returns Hash instance for subclasses" do
HashSpecs::MyHash[1 => 2, 3 => 4].reject { false }.should be_kind_of(Hash)
HashSpecs::MyHash[1 => 2, 3 => 4].reject { true }.should be_kind_of(Hash)
end
ruby_version_is ''...'2.7' do
it "does not taint the resulting hash" do
h = { a: 1 }.taint
h.reject {false}.should_not.tainted?
end
end
end
it "processes entries with the same order as reject!" do
h = { a: 1, b: 2, c: 3, d: 4 }
reject_pairs = []
reject_bang_pairs = []
h.dup.reject { |*pair| reject_pairs << pair }
h.reject! { |*pair| reject_bang_pairs << pair }
reject_pairs.should == reject_bang_pairs
end
it_behaves_like :hash_iteration_no_block, :reject
it_behaves_like :enumeratorized_with_origin_size, :reject, { 1 => 2, 3 => 4, 5 => 6 }
end
describe "Hash#reject!" do
it "removes keys from self for which the block yields true" do
hsh = {}
(1 .. 10).each { |k| hsh[k] = (k % 2 == 0) }
hsh.reject! { |k,v| v }
hsh.keys.sort.should == [1,3,5,7,9]
end
it "removes all entries if the block is true" do
h = { a: 1, b: 2, c: 3 }
h.reject! { |k,v| true }.should equal(h)
h.should == {}
end
it "is equivalent to delete_if if changes are made" do
hsh = { a: 1 }
hsh.reject! { |k,v| v < 2 }.should == hsh.dup.delete_if { |k, v| v < 2 }
end
it "returns nil if no changes were made" do
{ a: 1 }.reject! { |k,v| v > 1 }.should == nil
end
it "processes entries with the same order as delete_if" do
h = { a: 1, b: 2, c: 3, d: 4 }
reject_bang_pairs = []
delete_if_pairs = []
h.dup.reject! { |*pair| reject_bang_pairs << pair }
h.dup.delete_if { |*pair| delete_if_pairs << pair }
reject_bang_pairs.should == delete_if_pairs
end
it "raises a FrozenError if called on a frozen instance that is modified" do
-> { HashSpecs.empty_frozen_hash.reject! { true } }.should raise_error(FrozenError)
end
it "raises a FrozenError if called on a frozen instance that would not be modified" do
-> { HashSpecs.frozen_hash.reject! { false } }.should raise_error(FrozenError)
end
it_behaves_like :hash_iteration_no_block, :reject!
it_behaves_like :enumeratorized_with_origin_size, :reject!, { 1 => 2, 3 => 4, 5 => 6 }
end
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