mirror of
https://github.com/edgecase/ruby_koans.git
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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]
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assert_equal __([]), array[4,100]
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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
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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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