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Re: [External] : Re: Any faster way to find frequency of words?
From: |
Jean Louis |
Subject: |
Re: [External] : Re: Any faster way to find frequency of words? |
Date: |
Mon, 10 May 2021 19:26:18 +0300 |
User-agent: |
Mutt/2.0.6 (2021-03-06) |
* Drew Adams <drew.adams@oracle.com> [2021-05-10 17:03]:
> I use this, FWIW:
>
> (defun hash-table-to-alist (hash-table)
> "Create and return an alist created from HASH-TABLE.
> The order of alist entries is undefined, but it seems to be the same
> as the order of hash-table entries (which seems to be the order in
> which the entries were added to the table)."
> (let ((al ()))
> (maphash (lambda (key val) (push (cons key val) al))
> hash-table)
> (nreverse al)))
That may be better, nicer.
I wonder if nreverse is really needed as function just returns some
data, is that data anyway destroyed thereafter?
Then I was also using reverse, I will take it out, as I don't think
there is any order in the hash, if I reverse it or not, it does not
matter.
(setq hash (make-hash-table))
(puthash 'Name "Jimmy" hash)
(puthash "City" "New York" hash)
(puthash "Brigade" "II" hash)
hash ⇒ #s(hash-table size 65 test eql rehash-size 1.5 rehash-threshold 0.8125
data (Name "Jimmy" "City" "New York" "Brigade" "II"))
(puthash 'Name "Jimmy2" hash)
hash ⇒ #s(hash-table size 65 test eql rehash-size 1.5 rehash-threshold 0.8125
data (Name "Jimmy2" "City" "New York" "Brigade" "II"))
I can see that hash keeps order of entries, but I don't believe
that is guaranteed. Visually it gives us the same order:
(hash-table-to-alist hash) ⇒ ((Name . "Jimmy2") ("City" . "New York")
("Brigade" . "II"))
(setq alist (hash-table-to-alist hash)) ⇒ ((Name . "Jimmy2") ("City" . "New
York") ("Brigade" . "II"))
(assoc 'Name alist) ⇒ (Name . "Jimmy2")
I just wonder if the order matters. It should not matter in hash,
alist, plist I guess.
--
Jean
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- Any faster way to find frequency of words?, Jean Louis, 2021/05/09
- Re: Any faster way to find frequency of words?, Eric Abrahamsen, 2021/05/09
- Re: Any faster way to find frequency of words?, Emanuel Berg, 2021/05/09
- Re: Any faster way to find frequency of words?, Jean Louis, 2021/05/09
- Re: Any faster way to find frequency of words?, Eric Abrahamsen, 2021/05/09
- Re: Any faster way to find frequency of words?, Jean Louis, 2021/05/10
- RE: [External] : Re: Any faster way to find frequency of words?, Drew Adams, 2021/05/10
- Re: [External] : Re: Any faster way to find frequency of words?,
Jean Louis <=
- RE: [External] : Re: Any faster way to find frequency of words?, Drew Adams, 2021/05/10
- Re: [External] : Re: Any faster way to find frequency of words?, Jean Louis, 2021/05/10
Re: Any faster way to find frequency of words?, Emanuel Berg, 2021/05/09