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Only RHS-formula accepted as lambda function #6385

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Only RHS-formula accepted as lambda function #6385

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90c6446
only cast RHS formula to function
teunbrand Mar 28, 2025
6d01b3c
add test
teunbrand Mar 28, 2025
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2 changes: 1 addition & 1 deletion R/scale-.R
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Original file line number Diff line number Diff line change
Expand Up @@ -1454,5 +1454,5 @@ trans_support_nbreaks <- function(trans) {
}

allow_lambda <- function(x) {
if (is_formula(x)) as_function(x) else x
if (is_formula(x, lhs = FALSE)) as_function(x) else x
}
18 changes: 18 additions & 0 deletions tests/testthat/test-utilities.R
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Expand Up @@ -188,6 +188,24 @@ test_that("expose/ignore_data() can round-trip a data.frame", {

})

test_that("allow_lambda converts the correct cases", {

f <- allow_lambda(function(x) x + 1)
expect_equal(f(1), 2)

f <- allow_lambda(~ .x + 1)
expect_equal(f(1), 2)

f <- allow_lambda("A")
expect_equal(f, "A")

f <- allow_lambda(expression(A))
expect_equal(f, expression(A))

f <- allow_lambda(bquote("foo"~"bar"))
expect_equal(f, call("~", "foo", "bar"))
})

test_that("summary method gives a nice summary", {
# This test isn't important enough to break anything on CRAN
skip_on_cran()
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