Split by Scalar Index or Name

Splits by element position (`.size` measure) after resolving `at` to a single index. `at` can be a positive scalar integer index or a scalar character name.

Usage

split_at(x, at, pull_index = FALSE)

Arguments

x

A `flexseq`.

at

Positive scalar integer index or scalar character name.

pull_index

Logical switch between two-way and three-way split shape. If `TRUE`, uses [split_by_predicate()] and returns `list(left, right)`. If `FALSE`, uses [split_around_by_predicate()] and returns `list(left, elem, right)`.

Value

A split list, shape controlled by `pull_index`.

Examples

x <- as_flexseq(setNames(as.list(letters[1:6]), LETTERS[1:6]))
split_at(x, 3)
#> $left
#> FingerTree <size=2, named=yes>
#>   monoids: none
#> 
#> $A
#> [1] "a"
#> 
#> $B
#> [1] "b"
#> 
#> 
#> $elem
#> [1] "c"
#> attr(,"ft_name")
#> [1] "C"
#> 
#> $right
#> FingerTree <size=3, named=yes>
#>   monoids: none
#> 
#> $D
#> [1] "d"
#> 
#> $E
#> [1] "e"
#> 
#> $F
#> [1] "f"
#> 
#> 
split_at(x, "C", pull_index = TRUE)
#> $left
#> FingerTree <size=2, named=yes>
#>   monoids: none
#> 
#> $A
#> [1] "a"
#> 
#> $B
#> [1] "b"
#> 
#> 
#> $right
#> FingerTree <size=4, named=yes>
#>   monoids: none
#> 
#> $C
#> [1] "c"
#> 
#> $D
#> [1] "d"
#> 
#> $E
#> [1] "e"
#> 
#> $F
#> [1] "f"
#> 
#>