This function is a vectorized version of `switch()`

, that is, for
each element of input vector, `switch()`

is evaluated and the results are
combined.

`vmap(EXPR, ..., SIMPLIFY = TRUE)`

## Arguments

- EXPR
an expression evaluated to be character or numeric vector/list.

- ...
The list of alternatives for each `switch()`

.

- SIMPLIFY
`TRUE`

to simplify the resulted list to vector, matrix
or array if possible.

## Examples

```
x <- c("normal","normal","error","unknown","unknown")
vmap(x, normal = 0, error = -1, unknown = -2)
#> [1] 0 0 -1 -2 -2
x <- c(1,1,2,1,2,2,1,1,2)
vmap(x, "type-A", "type-B")
#> [1] "type-A" "type-A" "type-B" "type-A" "type-B" "type-B" "type-A" "type-A"
#> [9] "type-B"
```