Different Names

Different programming languages sometimes choose different names for similar operations. If you're new to Roc, you may be searching for a familiar operation and not find it because that operation (or a similar one) goes by a different name in Roc.

To help with this, here are some Roc operations along with some names found in other languages for similar operations.

Roc Name	Other Names
List.walk	fold foldl foldLeft fold_left fold-left reduce lreduce array_reduce inject accumulate Aggregate
List.walk_backwards	foldr foldRight fold_right fold-right reduceRight rreduce
List.first	head get(0) [0]
List.keep_if	filter select copy_if remove-if-not
List.drop_if	reject remove_copy_if remove-if
List.join	flatten flat concat smoosh
List.join_map	concatMap filterMap filter_map
List.keep_oks	compact filterMap(identity)
Result.try	bind flatMap andThen (>>=)
List.map2 x y Pair	zip