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require_relative '../../spec_helper'
describe "Array#dig" do
it "returns #at with one arg" do
['a'].dig(0).should == 'a'
['a'].dig(1).should be_nil
end
it "recurses array elements" do
a = [ [ 1, [2, '3'] ] ]
a.dig(0, 0).should == 1
a.dig(0, 1, 1).should == '3'
a.dig(0, -1, 0).should == 2
end
it "returns the nested value specified if the sequence includes a key" do
a = [42, { foo: :bar }]
a.dig(1, :foo).should == :bar
end
it "raises a TypeError for a non-numeric index" do
lambda {
['a'].dig(:first)
}.should raise_error(TypeError)
end
it "raises a TypeError if any intermediate step does not respond to #dig" do
a = [1, 2]
lambda {
a.dig(0, 1)
}.should raise_error(TypeError)
end
it "raises an ArgumentError if no arguments provided" do
lambda {
[10].dig()
}.should raise_error(ArgumentError)
end
it "returns nil if any intermediate step is nil" do
a = [[1, [2, 3]]]
a.dig(1, 2, 3).should == nil
end
it "calls #dig on the result of #at with the remaining arguments" do
h = [[nil, [nil, nil, 42]]]
h[0].should_receive(:dig).with(1, 2).and_return(42)
h.dig(0, 1, 2).should == 42
end
end
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