join
Functionjoin
produces a string by concatenating all of the elements of the specified
list of strings with the specified separator.
join(separator, list)
> join("-", ["foo", "bar", "baz"])
"foo-bar-baz"
> join(", ", ["foo", "bar", "baz"])
foo, bar, baz
> join(", ", ["foo"])
foo
split
performs the opposite operation: producing a list
by separating a single string using a given delimiter.