On Sunday, April 24, 2016 at 12:15:23 PM UTC+2, Ben Greenman wrote: > I think you want hash-clear! because I think you're using a mutable hashtable. > > > hash-clear! is for mutable hashtables (built with make-hash, added to with > hash-add!) and returns void after it updates its argument > hash-clear is for immutable hashes (build with hash or for/hash, added to > with hash-add) and returns a new hashtable -- for example: > > > (define h (hash 'a 1)) > > (define i (hash-clear h)) > > (hash-count h) > 1 > > (hash-count i) > 0 > > > > > > > > > > The notes on chaperones & impersonators are only about efficiency. They > shouldn't affect your choice. > > > > On Sun, Apr 24, 2016 at 5:11 AM, Damien Mattei <[email protected]> wrote: > hi, > > > > what is the best way to clear a hash table, hash-clear or hash-clear! ? if > the hash-table is defined in a code at top-level and used in functions as a > global variable, the issue i have is that when at REPL i use a first time my > function (that use hash-table) it's ok but when i reuse the function it > returns a wrong result as the hash-table is not redefined and cleared and has > data in it that make interfere with reuse of hash-table, so i need to clear > it ... > > i tried to read the story about chaperone and impersonator in the doc but my > english and the specificities of drracket scheme make that i do not > understand which of hash-clear or hash-clear! is more appropriate in this > case. > > > > regards, > > > > damien > > > > -- > > You received this message because you are subscribed to the Google Groups > "Racket Users" group. > > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > > For more options, visit https://groups.google.com/d/optout.
thanks you thats that what i had finally use,now i had no doubts thanks Damien -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
