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require 'spec_helper'
describe Immutable::List do
describe '#each_with_index' do
context 'with no block' do
let(:list) { L['A', 'B', 'C'] }
it 'returns an Enumerator' do
list.each_with_index.class.should be(Enumerator)
list.each_with_index.to_a.should == [['A', 0], ['B', 1], ['C', 2]]
end
end
context 'with a block' do
let(:list) { Immutable.interval(1, 1025) }
it 'returns self' do
list.each_with_index { |item, index| item }.should be(list)
end
it 'iterates over the items in order, yielding item and index' do
yielded = []
list.each_with_index { |item, index| yielded << [item, index] }
yielded.should == (1..list.size).zip(0..list.size.pred)
end
end
end
end
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