Append the RHS to the end of the LHS; equivalent to ++, but left-associative with precedence set to 0 (same as |>)

("ba" |> String.reverse) ++ "c"       --> "abc"
"ba" |> String.reverse ++ "c"         --> ERROR
"ba" |> String.reverse |++ "c"        --> "abc"

Append the item on the RHS to the end of the list on the LHS

[1] |:: 2         --> [1,2]
[1] |:: 2 |:: 3   --> [1,2,3]

Wrap LHS in a list, then append RHS list to it; equivalent to ::, but left-associative with precedence set to 0 (same as |>)

("a" ++ "b") :: ["cd","ef"]   --> ["ab","cd","ef"]
"a" ++ "b" :: ["cd","ef"]     --> ERROR
"a" ++ "b" :|++ ["cd","ef"]   --> ["ab","cd","ef"]

Wrap LHS in a list, then append the item on RHS to the list

1 :|:: 2    --> [1,2]

Forward operator for List.map

[1,4,9] .|> sqrt    --> [1,2,3]

Wrap LHS in a list, then apply RHS function

1 :|> List.head   --> Just 1