85 lines
2.1 KiB
Ruby
85 lines
2.1 KiB
Ruby
require File.expand_path(File.dirname(__FILE__) + '/neo')
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class AboutArrays < Neo::Koan
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def test_creating_arrays
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empty_array = Array.new
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assert_equal Array, empty_array.class
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assert_equal 0, empty_array.size
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end
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def test_array_literals
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array = Array.new
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assert_equal [], array
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array[0] = 1
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assert_equal [1], array
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array[1] = 2
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assert_equal [1, 2], array
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array << 333
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assert_equal [1, 2, 333], array
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end
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def test_accessing_array_elements
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array = [:peanut, :butter, :and, :jelly]
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assert_equal :peanut, array[0]
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assert_equal :peanut, array.first
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assert_equal :jelly, array[3]
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assert_equal :jelly, array.last
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assert_equal :jelly, array[-1]
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assert_equal :butter, array[-3]
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end
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def test_slicing_arrays
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array = [:peanut, :butter, :and, :jelly]
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assert_equal [:peanut], array[0,1]
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assert_equal [:peanut, :butter], array[0,2]
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assert_equal [:and, :jelly], array[2,2]
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assert_equal [:and, :jelly], array[2,20]
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assert_equal [], array[4,0] # NOTE: weird, you expect it to be nil but it's not. So upto `length` index, you get array back
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assert_equal [], array[4,100] # same weirdness as above
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assert_equal nil, array[5,0]
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end
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def test_arrays_and_ranges
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assert_equal Range, (1..5).class
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assert_not_equal [1,2,3,4,5], (1..5)
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assert_equal [1, 2, 3, 4, 5], (1..5).to_a # also weird, i thought .. should be exclusive
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assert_equal [1, 2, 3, 4], (1...5).to_a
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end
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def test_slicing_with_ranges
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array = [:peanut, :butter, :and, :jelly]
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assert_equal [:peanut, :butter, :and], array[0..2]
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assert_equal [:peanut, :butter], array[0...2]
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assert_equal [:and, :jelly], array[2..-1]
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end
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def test_pushing_and_popping_arrays
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array = [1,2]
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array.push(:last)
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assert_equal [1, 2, :last], array
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popped_value = array.pop
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assert_equal :last, popped_value
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assert_equal [1, 2], array
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end
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def test_shifting_arrays
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array = [1,2]
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array.unshift(:first)
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assert_equal [:first, 1, 2], array
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shifted_value = array.shift
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assert_equal :first, shifted_value
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assert_equal [1, 2], array
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end
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end
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