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describe "Pattern matching" do
before :each do
ScratchPad.record []
end
describe "Ruby 3.1 improvements" do
ruby_version_is "3.1" do
it "can omit parentheses in one line pattern matching" do
[1, 2] => a, b
[a, b].should == [1, 2]
{a: 1} => a:
a.should == 1
end
it "supports pinning instance variables" do
@a = /a/
case 'abc'
in ^@a
true
end.should == true
end
it "supports pinning class variables" do
result = nil
Module.new do
result = module_eval(<<~RUBY)
@@a = 0..10
case 2
in ^@@a
true
end
RUBY
end
result.should == true
end
it "supports pinning global variables" do
$a = /a/
case 'abc'
in ^$a
true
end.should == true
end
it "supports pinning expressions" do
case 'abc'
in ^(/a/)
true
end.should == true
case 0
in ^(0 + 0)
true
end.should == true
end
it "supports pinning expressions in array pattern" do
case [3]
in [^(1 + 2)]
true
end.should == true
end
it "supports pinning expressions in hash pattern" do
case {name: '2.6', released_at: Time.new(2018, 12, 25)}
in {released_at: ^(Time.new(2010)..Time.new(2020))}
true
end.should == true
end
end
end
end
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