Question / New Feature Request: Looking for a way to update a subset of list elements based on a condition

[wdm0336]

Love the package but I keep running into the need to change a field in only a subset of the elements in the list. Is there a way to do this today?

For example, something like:

foo <- list(
    list(a = 1, b = 10),
    list(a = 2, b = 20),
    list(a = 3, b = 30)
)

# change field 'b' to 300 in each list element where field 'a' is a 3
foo <- foo |>
    rlist::list.update_with_condition(a == 3, b = 300)

giving:

list(
    list(a = 1, b = 10),
    list(a = 2, b = 20),
    list(a = 3, b = 300)
)

Today, I end up doing it with lapply:

# change field 'b' to 300 in each list element where field 'a' is a 3
foo <- lapply(foo, function(x) {
    if (x$a == 3) {
        x$b <- 300
    }
    x
})