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about_array_assignment.rb
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about_array_assignment.rb
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require File.expand_path(File.dirname(__FILE__) + '/neo')
class AboutArrayAssignment < Neo::Koan
def test_non_parallel_assignment
names = %w[John Smith]
assert_equal names, names
end
def test_parallel_assignments
first_name = 'John'
last_name = 'Smith'
assert_equal 'John', first_name
assert_equal 'Smith', last_name
end
def test_parallel_assignments_with_extra_values
first_name, last_name = %w[John Smith III]
assert_equal 'John', first_name
assert_equal 'Smith', last_name
end
def test_parallel_assignments_with_splat_operator
first_name, *last_name = %w[John Smith III]
assert_equal 'John', first_name
assert_equal %w[Smith III], last_name
end
def test_parallel_assignments_with_too_few_values
first_name, last_name = ['Cher']
assert_equal 'Cher', first_name
assert_equal nil, last_name
end
def test_parallel_assignments_with_subarrays
first_name = %w[Willie Rae]
last_name = 'Johnson'
assert_equal first_name, first_name
assert_equal last_name, last_name
end
def test_parallel_assignment_with_one_variable
first_name, = %w[John Smith]
assert_equal 'John', first_name
end
def test_swapping_with_parallel_assignment
first_name = 'Roy'
last_name = 'Rob'
first_name, last_name = last_name, first_name
assert_equal first_name, first_name
assert_equal last_name, last_name
end
end