class Questions::Issue20260209

Answers::Issue20260209

Question

Given an integer array and a number n, move all of the ns to the end of the array while maintaining the relative order of the non-ns.

Bonus: do this without making a copy of the array!

Example

Public Instance Methods

setup ()

Source

# File questions/20260209.rb, line 22
def setup
  @methods  = Answers::Issue20260209.instance_methods(false)
  @integers = [0, 2, 0, 3, 10]
  @number_n = 0
  @expected = [2, 3, 10, 0, 0]
end

Tests

Public Instance Methods

test_answers ()

Source

# File questions/20260209.rb, line 31
def test_answers
  @methods.each do |method|
    actual = public_send(method, @integers.clone, @number_n)

    assert_equal @expected, actual, "Answer #{method} is not correct"
  end
end

test_answers_with_array_copy ()

Source

# File questions/20260209.rb, line 39
def test_answers_with_array_copy
  @methods.reject { it.end_with?("!") }.each do |method|
    integers = @integers.clone
    actual   = public_send(method, integers, @number_n)

    refute_same integers, actual, "Answer #{method} is not making a copy of array"
  end
end

test_answers_without_array_copy ()

Source

# File questions/20260209.rb, line 48
def test_answers_without_array_copy
  @methods.select { it.end_with?("!") }.each do |method|
    integers = @integers.clone
    actual   = public_send(method, integers, @number_n)

    assert_same integers, actual, "Answer #{method} is making a copy of array"
  end
end