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The `shift()` function removes the first element of the given source array.
Returns the removed value.
Returns `null` if the given source argment is not an array.
Throws a type exception if the given array is immuatable.
-- Testcase --
{%
let arr = [ 1, null, 3 ];
printf("%.J\n", [
// remove one element
shift(arr),
// remove a null element
shift(arr),
// invalid source
shift({ test: true })
]);
printf("%.J\n", arr);
%}
-- End --
-- Expect stdout --
[
1,
null,
null
]
[
3
]
-- End --
|
