Ruby 初学者 - 意外的输入结束，期待 keywords_end

我对 ruby​​ 非常陌生，我正在尝试遵循有关如何构建矩形的说明。我正在尽可能仔细地跟踪，我三次检查我输入的内容是否正确。我什至重新输入了它。问题似乎到了最后。我的终端不断出现错误：Shapes.rb:25：语法错误，意外的输入结束，期待keyword_end

谁能帮我？我认为这可能是 1.upto 的问题，但我不确定。太感谢了！！

    puts "Welcome to Shapes"
    print "How big do you want your shape? "
    shape_size = gets
    shape_size = shape_size.chomp
    print "Outside letter: "
    outside_letter = gets
    outside_letter = outside_letter.chomp
    print " Inside Letter: "
    inside_letter = gets
    inside_letter = inside_letter.chomp
    puts "About to draw a shape #{shape_size} big"
    puts "using #{outside_letter} for the edge"
    puts "and #{inside_letter} for the inside"
    width = shape_size
    height=shape_size
    1.upto(height) do |row|
    if row==1
        puts outside_letter * width
    elsif row==height
        puts outside_letter * width
    else
        middle= inside_letter * (width-2)
    puts
        "#{outside_letter}#{middle}#{outside_letter}"
    end

你还需要一份end:

puts "Welcome to Shapes"
print "How big do you want your shape? "
shape_size = gets
shape_size = shape_size.chomp
print "Outside letter: "
outside_letter = gets
outside_letter = outside_letter.chomp
print " Inside Letter: "
inside_letter = gets
inside_letter = inside_letter.chomp
puts "About to draw a shape #{shape_size} big"
puts "using #{outside_letter} for the edge"
puts "and #{inside_letter} for the inside"
width = shape_size
height=shape_size
1.upto(height) do |row|
  if row==1
    puts outside_letter * width
  elsif row==height
    puts outside_letter * width
  else
    middle= inside_letter * (width-2)
    puts
    "#{outside_letter}#{middle}#{outside_letter}"
  end
end # <--- here

既然你在这里学习，我觉得有必要添加更多细节：

当你有一个块时，例如1.upto(height) do |row|在你的代码中，总是需要一个end，因为它是一个块（将其视为一个代码单元）。在该块中，您正在为可枚举（例如数组）中的每个项目执行代码。在这种情况下，您的枚举是一个由 1 到 的值之间的每个整数组成的数组height:

2.3.0 :005 > 1.upto(4) do |number|
2.3.0 :006 >     puts "The number is: #{number}"
2.3.0 :007?>   end
The number is: 1
The number is: 2
The number is: 3
The number is: 4