为什么这不起作用 - 红宝石koans

Question

我想出了以下解决方案的公仔。

# and 
# about_triangle_project_2.rb 
# 
def triangle(a, b, c) 

    driehoek = Array.new[ a, b, c].sort 

    raise (TriangleError), "length cannnot be 0 or lesser" if (driehoek[0] <= 0) 
    raise (TriangleError), "impossible triangle" if (driehoek[0] + driehoek[1] < driehoek[2]) 

return :equilateral if ((a == b) and (b == c)) 
return :isosceles if (((a == b) and (b != c)) or 
        ((a != b) and (b == c)) or 
        ((a == c) and (a != b))) 
    return :scalene if ((a !=b) and (b != c)) 
end 

# Error class used in part 2. No need to change this code. 
class TriangleError < StandardError 
end 

但现在当三角[2,2,2]使用我看到此错误消息：

The answers you seek... 
wrong number of arguments (3 for 2) 

Please meditate on the following code: 
    ./triangle.rb:18:in `[]' 
    ./triangle.rb:18:in `triangle' 

谁能告诉我这里有什么问题？

Roelof

Answer 1

问题在于你如何创建数组。 new是一种方法，您需要使用parens()。更改此：

driehoek = Array.new[ a, b, c].sort 

为了这一点，它应该工作：

driehoek = Array.new([a, b, c]).sort