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require 'spec_helper'
describe Immutable::List do
describe '#transpose' do
it 'takes a list of lists and returns a list of all the first elements, all the 2nd elements, and so on' do
L[L[1, 'a'], L[2, 'b'], L[3, 'c']].transpose.should eql(L[L[1, 2, 3], L['a', 'b', 'c']])
L[L[1, 2, 3], L['a', 'b', 'c']].transpose.should eql(L[L[1, 'a'], L[2, 'b'], L[3, 'c']])
L[].transpose.should eql(L[])
L[L[]].transpose.should eql(L[])
L[L[], L[]].transpose.should eql(L[])
L[L[0]].transpose.should eql(L[L[0]])
L[L[0], L[1]].transpose.should eql(L[L[0, 1]])
end
it 'only goes as far as the shortest list' do
L[L[1,2,3], L[2]].transpose.should eql(L[L[1,2]])
end
end
end
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