I feel similarly: always use a built-in if there is one, even for
something as simple as this. I couldn't find one either, and my
solution is basically the same as Benny's, but there's no particular
need to (let) the count, and once that's removed it's so short it
almost doesn't merit a defn anymore:
(let [a '(1 2 3 4 5 6 7 8 9 10)
b '(54 666 23)]
(concat b (drop (count b) a)))
=> (54 666 23 4 5 6 7 8 9 10)
On Dec 18, 2:32 pm, Glen Rubin <rubing...@gmail.com> wrote:
> ok that's looks very succinct, I will use it. Just figured I would
> ask if it exists, b/c always prefer to use a built-in and it sounded
> basic enough to be. thanks!
>
> On Dec 18, 5:15 pm, Benny Tsai <benny.t...@gmail.com> wrote:
>
> > I didn't see a built-in fn for this, and couldn't restrain myself from
> > trying to write one:
>
> > (defn replace-first-n [xs ys]
> > (let [n (count ys)]
> > (concat ys (drop n xs))))
>
> > On Dec 18, 2:38 pm, Glen Rubin <rubing...@gmail.com> wrote:
>
> > > I am looking for a fn that does the following. Let's say i have
> > > sequences A & B
>
> > > A: '(1 2 3 4 5 6 7 8 9 10)
>
> > > B '(54 666 23)
>
> > > I want to replace A's first items with B's, so that I get:
>
> > > '(54 666 23 4 5 6 7 8 9 10)
>
> > > Is there a fn to do this? Otherwise, I will write one. Thanks!
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