Push an element to the front

Usage

push_front(x, value)

Arguments

x: A `flexseq`.
value: Element to push.

Value

Updated tree. If `x` is name-indexed, pushing unnamed elements is invalid.

Examples

s <- as_flexseq(letters[2:4])
s2 <- push_front(s, "a")
s2
#> FingerTree <size=4, named=no>
#>   monoids: none
#> 
#> [[1]]
#> [1] "a"
#> 
#> [[2]]
#> [1] "b"
#> 
#> [[3]]
#> [1] "c"
#> 
#> [[4]]
#> [1] "d"
#> 

n <- as_flexseq(list(two = 2, three = 3))
new_el <- 1
names(new_el) <- "one"
push_front(n, new_el)
#> FingerTree <size=3, named=yes>
#>   monoids: none
#> 
#> $one
#> one 
#>   1 
#> 
#> $two
#> [1] 2
#> 
#> $three
#> [1] 3
#>