Grokbase › Groups › Go › golang-nuts › January 2015
FAQ
1.
copy(s[i:],s[i+:])
s[len(s)-1]=nil

2.
s = append(s[:i],s[i+1:])

which is better?

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  • Konstantin Khomoutov at Jan 13, 2015 at 2:44 pm ⇧

    On Tue, 13 Jan 2015 06:38:14 -0800 (PST) Gao wrote:

    1.
    copy(s[i:],s[i+:])
    s[len(s)-1]=nil

    2.
    s = append(s[:i],s[i+1:])

    which is better?
    You might consider using a linked list [1] or a map instead.

    1. http://golang.org/pkg/container/list/

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  • Gao at Jan 13, 2015 at 3:12 pm ⇧
    I think if a func returns `container.List` is less explicit than a func
    retuning `[]ele`.

    On Tuesday, January 13, 2015 at 10:44:39 PM UTC+8, Konstantin Khomoutov
    wrote:
    On Tue, 13 Jan 2015 06:38:14 -0800 (PST)
    Gao <gaop...@gmail.com <javascript:>> wrote:
    1.
    copy(s[i:],s[i+:])
    s[len(s)-1]=nil

    2.
    s = append(s[:i],s[i+1:])

    which is better?
    You might consider using a linked list [1] or a map instead.

    1. http://golang.org/pkg/container/list/
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  • James Bardin at Jan 13, 2015 at 3:15 pm ⇧

    On Tuesday, January 13, 2015 at 9:44:39 AM UTC-5, Konstantin Khomoutov wrote:

    On Tue, 13 Jan 2015 06:38:14 -0800 (PST)
    Gao <gaop...@gmail.com <javascript:>> wrote:
    1.
    copy(s[i:],s[i+:])
    s[len(s)-1]=nil

    This isn't valid syntax, and doesn't properly remove an item. You're
    looking for something like

    a = a[:i+copy(a[i:], a[i+1:])]


    2.
    s = append(s[:i],s[i+1:])
    your append needs and ellipsis [...]

    https://github.com/golang/go/wiki/SliceTricks

    which is better?
    They are essentially identical. I prefer the copy, only because I think
    it's more obvious what you're doing.


    You might consider using a linked list [1] or a map instead.
    That's not really helpful, since one often needs to remove an element from
    a slice even when it is the proper data structure.

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  • Gao at Jan 13, 2015 at 3:43 pm ⇧

    On Tuesday, January 13, 2015 at 11:15:01 PM UTC+8, James Bardin wrote:


    On Tuesday, January 13, 2015 at 9:44:39 AM UTC-5, Konstantin Khomoutov
    wrote:
    On Tue, 13 Jan 2015 06:38:14 -0800 (PST)
    Gao wrote:
    1.
    copy(s[i:],s[i+:])
    s[len(s)-1]=nil

    This isn't valid syntax, and doesn't properly remove an item. You're
    looking for something like

    a = a[:i+copy(a[i:], a[i+1:])]


    2.
    s = append(s[:i],s[i+1:])
    your append needs and ellipsis [...]

    https://github.com/golang/go/wiki/SliceTricks
    I didn't check the correctness,and thank for theses tricks.
    which is better?
    They are essentially identical. I prefer the copy, only because I think
    it's more obvious what you're doing.
    Why are they identical?
    You might consider using a linked list [1] or a map instead.
    That's not really helpful, since one often needs to remove an element from
    a slice even when it is the proper data structure.
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  • James Bardin at Jan 13, 2015 at 3:54 pm ⇧

    On Tue, Jan 13, 2015 at 10:43 AM, Gao wrote:

    They are essentially identical. I prefer the copy, only because I think
    it's more obvious what you're doing.
    Why are they identical?
    If the the slice has enough capacity (which it always will when removing an
    item), append sets the correct length and copies the data; exactly what
    you're doing with the copy+slice operation.

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postedJan 13, '15 at 2:38p
activeJan 13, '15 at 3:54p
posts6
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websitegolang.org

3 users in discussion

Gao: 3 posts James Bardin: 2 posts Konstantin Khomoutov: 1 post

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