(koans) another problem (syntax error)


I now trying to solve this one :

Triangle Project Code.

Triangle analyzes the lengths of the sides of a triangle

(represented by a, b and c) and returns the type of triangle.

It returns:

:equilateral if all sides are equal

:isosceles if exactly 2 sides are equal

:scalene if no sides are equal

The tests for this method can be found in




def triangle(a, b, c)
if ((a == b) and (b == c))
return :equilateral
if (((a == b) and (b != c)) or ((a != b) and (b == c)))
return :isosceles
if ((a !=b) and (b != c))
return :scalene

But I see this error message :

/about_triangle_project.rb:4:in require': ./triangle.rb:27: syntax error, unexpected $end, expecting kEND (SyntaxError) from ./about_triangle_project.rb:4 from path_to_enlightenment.rb:18:inrequire’
from path_to_enlightenment.rb:18

Can anyone give me a tip what I have done wrong ?


On Fri, Sep 21, 2012 at 5:12 PM, roelof [email protected] wrote:

:equilateral if all sides are equal

 return :equilateral
from ./about_triangle_project.rb:4
from path_to_enlightenment.rb:18:in `require'
from path_to_enlightenment.rb:18

Can anyone give me a tip what I have done wrong ?

you’re missing end(s). if you switch the positions of if and return or
you put it in one line, it should solve the error

return :scalene if ((a !=b) and (b != c))

[email protected]
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That solved my problem.


Op vrijdag 21 september 2012 09:12:46 UTC+2 schreef roelof het volgende:

On Fri, Sep 21, 2012 at 3:12 AM, roelof [email protected] wrote:

/about_triangle_project.rb:4:in `require’: ./triangle.rb:27: syntax error,
unexpected $end, expecting kEND (SyntaxError)

Two option already given are to add some ends, or make them a series
of oneliners. But, you could also solve it by making all but the
first if, "elsif"s instead. Actually you can make the third one just
an else, since that’s the only remaining option. You’ll still need
one more end, though, to end the if-series.

Another way that springs to my twisted little mind, though, is to just
see how many unique lengths you have:

[:equilateral, :isosceles, :scalene][[a,b,c].uniq.length - 1]

Do NOT put something that “clever” in anything actually important, as
the lack of clarity isn’t worth the conciseness. But it makes a neat
little mind-exercise. :wink:


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