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first(named_vector) removes names #2487

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first(named_vector) removes names#2487
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@franknarf1
franknarf1
opened on Nov 15, 2017
library(data.table)
x = setNames(, "A")
x[1]
#>   A 
#> "A"
first(x)
#> [1] "A"

In example(first), it suggests first(x) and x[1] should be interchangeable, but it doesn't hold here.

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  1. MichaelChirico commented on Nov 16, 2017

    @MichaelChirico
    MichaelChirico
    on Nov 16, 2017
    Member

    To be clear, you aren't requesting that first(x) keeps the names, just that the documentation should clarify this distinction, right?

  2. franknarf1 commented on Nov 16, 2017

    @franknarf1
    franknarf1
    on Nov 16, 2017
    ContributorAuthor

    @MichaelChirico Yeah, a very minor request, but it bit me when I was using lapply and then accessing the results by name. Maybe first/last also strips other attributes; I didn't check and don't know the internals, so I'm not sure exactly what the doc should say about it.

  3. Henrik-P commented on Nov 17, 2017

    @Henrik-P
    Henrik-P
    on Nov 17, 2017

    Somewhat related: Documentation: first(x) # [not always the] same as x[1]

  4. jangorecki
    added
    documentation
    on Apr 6, 2020
  5. jangorecki
    changed the title [-][Doc request] first(named_vector) removes names[/-] [+]first(named_vector) removes names[/+] on Apr 6, 2020
  6. jangorecki
    added
    help-wanted
    on Jan 7, 2024
  7. tdhock
    closed this as completedon Jun 12, 2025
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