This function was deprecated in purrr 1.0.0 because it's not related to the core purpose of purrr.

This is a companion to `append()`

to help merging two
lists or atomic vectors. `prepend()`

is a clearer semantic
signal than `c()`

that a vector is to be merged at the beginning of
another, especially in a pipe chain.

## Arguments

- x
the vector to be modified.

- values
to be included in the modified vector.

- before
a subscript, before which the values are to be appended. If

`NULL`

, values will be appended at the beginning even for`x`

of length 0.

## Examples

```
x <- as.list(1:3)
x |> append("a")
#> [[1]]
#> [1] 1
#>
#> [[2]]
#> [1] 2
#>
#> [[3]]
#> [1] 3
#>
#> [[4]]
#> [1] "a"
#>
x |> prepend("a")
#> Warning: `prepend()` was deprecated in purrr 1.0.0.
#> ℹ Please use append(after = 0) instead.
#> [[1]]
#> [1] "a"
#>
#> [[2]]
#> [1] 1
#>
#> [[3]]
#> [1] 2
#>
#> [[4]]
#> [1] 3
#>
x |> prepend(list("a", "b"), before = 3)
#> [[1]]
#> [1] 1
#>
#> [[2]]
#> [1] 2
#>
#> [[3]]
#> [1] "a"
#>
#> [[4]]
#> [1] "b"
#>
#> [[5]]
#> [1] 3
#>
prepend(list(), x)
#> [[1]]
#> [1] 1
#>
#> [[2]]
#> [1] 2
#>
#> [[3]]
#> [1] 3
#>
```