I want to write a word "group-by" that has following stack effect and
behavior:
Signature:
: group-by ( seq quot -- alist ) (group-by-impl) ;
Input:
{ "hello" "hola" "ball" "scala" "java" "factor" "python" } [ length ]
group-by
Output:
H{
{ 5 { "hello" "scala" } }
{ 4 { "hola" "ball" "java" } }
{ 6 { "factor" "python" } }
}
I tried this many times, but failed. Can someone please provide me an
implementation for this, preferably with an explanation?
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