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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
require_relative 'shared/enumeratorize'
require_relative '../enumerable/shared/enumeratorized'
# Modifying a collection while the contents are being iterated
# gives undefined behavior. See
# https://blade.ruby-lang.org/ruby-core/23633
describe "Array#each_index" do
before :each do
ScratchPad.record []
end
it "passes the index of each element to the block" do
a = ['a', 'b', 'c', 'd']
a.each_index { |i| ScratchPad << i }
ScratchPad.recorded.should == [0, 1, 2, 3]
end
it "returns self" do
a = [:a, :b, :c]
a.each_index { |i| }.should equal(a)
end
it "is not confused by removing elements from the front" do
a = [1, 2, 3]
a.shift
ScratchPad.record []
a.each_index { |i| ScratchPad << i }
ScratchPad.recorded.should == [0, 1]
a.shift
ScratchPad.record []
a.each_index { |i| ScratchPad << i }
ScratchPad.recorded.should == [0]
end
it_behaves_like :enumeratorize, :each_index
it_behaves_like :enumeratorized_with_origin_size, :each_index, [1,2,3]
end
describe "Array#each_index" do
it "tolerates increasing an array size during iteration" do
array = [:a, :b, :c]
ScratchPad.record []
i = 0
array.each_index do |index|
ScratchPad << index
array << i if i < 100
i += 1
end
ScratchPad.recorded.should == (0..102).to_a # element indices
end
end
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