Created
March 13, 2016 21:45
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Array flatten
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| #!/usr/bin/env ruby | |
| require 'test/unit' | |
| def flatten(array) | |
| f = [] | |
| if array.kind_of?(Array) | |
| array.each{ |e| f.concat(e.kind_of?(Array) ? flatten(e) : [e]) } | |
| else | |
| f = [array] | |
| end | |
| f | |
| end | |
| class TestFlatten < Test::Unit::TestCase | |
| def test_empty | |
| assert_equal([], flatten([])) | |
| end | |
| def test_already_flatten | |
| assert_equal([1,2,3], flatten([1,2,3])) | |
| end | |
| def test_one_nested_array | |
| assert_equal([1,2,3], flatten([1,[2,3]])) | |
| end | |
| def test_two_nesting_levels | |
| assert_equal([1,2,3,4], flatten([[1,2,[3]],4])) | |
| end | |
| def test_not_array_input_returns_one_element_array | |
| assert_equal([1], flatten(1)) | |
| end | |
| end |
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