Here is a text editer written in k

    \l view.k

    /key(return back ^delete) 
    kx:kr:{u,:,(j,j+#x;*k_a);e[k]x};kb:{$[=/k;J j-1 0;];kx""};cd:{J j+!2;kx""}

    /edit(undo cut paste)
    e:{a::?[a;x;y];J(*x)+#y};cz:{$[#u;e/_`u;]};cx:{kx cc`};cv:{kx@9'`}

    /save
    cs:{n::$[#n;n;0'""]1:a;r::a}

http://kparc.com/$/

It's not something I find appealing, personally. Then again I am a python guy, which is about as far from this as you can get.