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require_relative '../../spec_helper'
ruby_version_is '2.3' do
describe "Hash#dig" do
it "returns #[] with one arg" do
h = { 0 => false, a: 1 }
h.dig(:a).should == 1
h.dig(0).should be_false
h.dig(1).should be_nil
end
it "returns the nested value specified by the sequence of keys" do
h = { foo: { bar: { baz: 1 } } }
h.dig(:foo, :bar, :baz).should == 1
h.dig(:foo, :bar, :nope).should be_nil
h.dig(:foo, :baz).should be_nil
h.dig(:bar, :baz, :foo).should be_nil
end
it "returns the nested value specified if the sequence includes an index" do
h = { foo: [1, 2, 3] }
h.dig(:foo, 2).should == 3
end
it "returns nil if any intermediate step is nil" do
h = { foo: { bar: { baz: 1 } } }
h.dig(:foo, :zot, :xyz).should == nil
end
it "raises an ArgumentError if no arguments provided" do
lambda { { the: 'borg' }.dig() }.should raise_error(ArgumentError)
end
it "handles type-mixed deep digging" do
h = {}
h[:foo] = [ { bar: [ 1 ] }, [ obj = Object.new, 'str' ] ]
def obj.dig(*args); [ 42 ] end
h.dig(:foo, 0, :bar).should == [ 1 ]
h.dig(:foo, 0, :bar, 0).should == 1
h.dig(:foo, 1, 1).should == 'str'
# MRI does not recurse values returned from `obj.dig`
h.dig(:foo, 1, 0, 0).should == [ 42 ]
h.dig(:foo, 1, 0, 0, 10).should == [ 42 ]
end
it "raises TypeError if an intermediate element does not respond to #dig" do
h = {}
h[:foo] = [ { bar: [ 1 ] }, [ nil, 'str' ] ]
lambda { h.dig(:foo, 0, :bar, 0, 0) }.should raise_error(TypeError)
lambda { h.dig(:foo, 1, 1, 0) }.should raise_error(TypeError)
end
it "calls #dig on the result of #[] with the remaining arguments" do
h = { foo: { bar: { baz: 42 } } }
h[:foo].should_receive(:dig).with(:bar, :baz).and_return(42)
h.dig(:foo, :bar, :baz).should == 42
end
it "respects Hash's default" do
default = {bar: 42}
h = Hash.new(default)
h.dig(:foo).should equal default
h.dig(:foo, :bar).should == 42
end
end
end
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