I have now this :
(ns fourclojure.core
(:gen-class))
(defn checker [x]
( = x (if (string? x)
(clojure.string/reverse x)
(into (empty x) (reverse x)))))
(checker '(1 2 3 4 5)) true
( = '( 1 2 3 4 5) '( 5 4 3 2 1) ) false
So something is wrong about my code
it works fine with string but not with a set
Roelof
Op woensdag 7 oktober 2015 23:40:11 UTC+2 schreef Erik Assum:
> I do believe that a palindrome could be defined as
>
> user> (defn palindrome [s] (= s (clojure.string/reverse s)))
> ;; => #'user/palindrome
> user> (palindrome "agnesisenga")
> ;; => true
> user>
>
> No need to split in half.
>
>
> > On 7. okt. 2015, at 20.24, Tristan Strange <[email protected]
> <javascript:>> wrote:
> >
> > Hey Roelof,
> >
> > Moe's answered your question perfectly.
> >
> > Unfortunately I'm not sure it'll help you. All that's been written up
> > there is a reverse function that works on both a string and a
> > sequence.
> >
> > Firstly I think you might need to check up on what a palindrome is:
> > https://en.wikipedia.org/wiki/Palindrome
> >
> > You need to:
> > - take the first half of the sequence
> > - take second half
> > - compare them
> >
> > and work around the fact that sometimes sequences have an odd number
> > of elements.
> >
> > Have you seen the take and drop functions yet? They'd really help. As
> > would Math/floor and Math/ceil. Those, a reverse and an = will make
> > bob your uncle.
> >
> > If you haven't seen them writing a recursive function would be a
> solution too.
> >
> > I'm not sure what the "hint" is about. It seems very misleading to me.
> >
> > Good luck!
> >
> > Cheers,
> > Tristan
> >
> >
> > On 7 October 2015 at 19:06, Moe Aboulkheir <[email protected]
> <javascript:>> wrote:
> >> Roelof,
> >>
> >> Something like this:
> >>
> >> (defn palindrome [x]
> >> (if (string? x)
> >> (clojure.string/reverse x)
> >> (into (empty x) (reverse x))))
> >>
> >> Alternatively, you may want to consider explicitly using seq on your
> inputs
> >> when you get them, and using that of the basis of comparison & input to
> >> reverse. If you don't actually care about the concrete sequence type
> (i.e.
> >> you only want sensible equality semantics after reversing something),
> >> dropping it as soon as possible may be a better strategy.
> >>
> >> Take care,
> >> Moe
> >>
> >> On Wed, Oct 7, 2015 at 6:51 PM, Roelof Wobben <[email protected]
> <javascript:>>
> >> wrote:
> >>>
> >>> Hello,
> >>>
> >>> I try to solve a problem for 4clojure where I have to make a
> palingdrome
> >>> detector.
> >>>
> >>> So for trying I did this :
> >>>
> >>> (ns fourclojure.core
> >>> (:gen-class))
> >>>
> >>>
> >>> (defn palingdrome [string]
> >>> ( reverse string))
> >>>
> >>> (apply str (palingdrome '( 1 2 3) )) '321'
> >>> (apply str (palingdrome "Roelof" )) "foleoR"
> >>>
> >>> (defn palingdrome2 [string]
> >>> ( reverse string))
> >>>
> >>> (palingdrome2 '( 1 2 3) ) ( 3 2 1 )
> >>> (palingdrome2 "Roelof" ) (\f \o \l \e \o \R)
> >>>
> >>> So it works for a map or for a string.
> >>>
> >>> Is there a way I can make it work for both ?
> >>>
> >>> Roelof
> >>>
> >>>
> >>>
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