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feat: add compact #129

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Merged
merged 3 commits into from
Feb 5, 2025
Merged

feat: add compact #129

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7dc8e7a
feat: add compact
m-muecke Jan 24, 2025
30d9f52
docs: missing document
m-muecke Jan 24, 2025
2a4b87d
Merge branch 'mlr-org:main' into compact
m-muecke Jan 24, 2025
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1 change: 1 addition & 0 deletions NAMESPACE
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Original file line number Diff line number Diff line change
Expand Up @@ -63,6 +63,7 @@ export(chunk_vector)
export(cite_bib)
export(clbk)
export(clbks)
export(compact)
export(compose)
export(compute_mode)
export(count_missing)
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7 changes: 7 additions & 0 deletions R/purrr_map.R
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Expand Up @@ -13,6 +13,7 @@
#' * `map_at()` applies `.f` to each element of `.x` referenced by `.at`. All other elements remain unchanged.
#' * `keep()` keeps those elements of `.x` where predicate `.p` evaluates to `TRUE`.
#' * `discard()` discards those elements of `.x` where predicate `.p` evaluates to `TRUE`.
#' * `compact()` discards elements of `.x` that are `NULL`.
#' * `every()` is `TRUE` if predicate `.p` evaluates to `TRUE` for each `.x`.
#' * `some()` is `TRUE` if predicate `.p` evaluates to `TRUE` for at least one `.x`.
#' * `detect()` returns the first element where predicate `.p` evaluates to `TRUE`.
Expand Down Expand Up @@ -272,6 +273,12 @@ discard.data.table = function(.x, .p, ...) { # nolint
.x[, is.na(.sel) | !.sel, with = FALSE]
}

#' @export
#' @rdname compat-map
compact = function(.x) { # nolint
.x[as.logical(lengths(.x))]
}

#' @export
#' @rdname compat-map
map_if = function(.x, .p, .f, ...) {
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4 changes: 4 additions & 0 deletions man/compat-map.Rd
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9 changes: 9 additions & 0 deletions tests/testthat/test_map.R
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Expand Up @@ -201,6 +201,15 @@ test_that("detect", {
expect_null(out)
})

test_that("compact", {
x = list(a = 1:3, b = c("a", "b"), c = NULL, d = NULL)
out = compact(x)
expect_identical(out, x[1:2])
x = list(a = 1:3, b = c("a", "b"), c = runif(3))
out = compact(x)
expect_identical(out, x)
})

test_that("pmap does not segfault (#56)", {
expect_error(pmap(1:4, function(x) x), "list")
})
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