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The `join()` function constructs a string out of the given array by
converting each array item into a string and then joining these substrings
putting the given separator value in between. An empty array will result in
an empty string.
The separator argument is converted into a string in case it is not already
a string value.
Returns `null` if the given array argument is not an array value.
-- Testcase --
{%
printf("%.J\n", [
join("|", []),
join("|", [ 1, 2, 3 ]),
join("|", [ null, false, "" ]),
join(123, [ "a", "b", "c" ]),
join(123, { "not": "an", "array": "value" })
]);
%}
-- End --
-- Expect stdout --
[
"",
"1|2|3",
"null|false|",
"a123b123c",
null
]
-- End --
|
