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The utpl script language supports declaring arrays using JSON notation.
-- Expect stdout --
[ ]
[ "first", "second", 123, [ "a", "nested", "array" ], { "a": "nested object" } ]
-- End --
-- Testcase --
{%
// An empty array can be declared using a pair of square brackets
empty_array = [ ];
// JSON notation is used to declare an array with contents
json_array = [
"first",
"second",
123,
[ "a", "nested", "array" ],
{ a: "nested object" }
];
// Printing (or stringifying) arrays will return their JSON representation
print(empty_array, "\n");
print(json_array, "\n");
-- End --
Additionally, utpl implements ES6-like spread operators to allow shallow copying
of array values into other arrays.
-- Expect stdout --
[ 1, 2, 3 ]
[ 1, 2, 3, 4, 5, 6 ]
[ 1, 2, 3, 4, 5, 6, false, true ]
[ 1, 2, 3, false, true, 4, 5, 6 ]
[ 1, 2, 3, [ 4, 5, 6 ] ]
-- End --
-- Testcase --
{%
a1 = [ 1, 2, 3 ];
a2 = [ 4, 5, 6 ];
print(join("\n", [
// copying one array into another
[ ...a1 ],
// combining two arrays
[ ...a1, ...a2 ],
// copying array and append values
[ ...a1, ...a2, false, true ],
// copy array and interleave values
[ ...a1, false, true, ...a2 ],
// nested spread operators
[ ...a1, [ ...a2 ] ]
]), "\n");
%}
-- End --
Contrary to merging arrays into objects, objects cannot be merged into arrays.
-- Expect stderr --
Type error: ({ "foo": true, "bar": false }) is not iterable
In line 5, byte 21:
` print([ ...arr, ...obj ], "\n");`
Near here -------------^
-- End --
-- Testcase --
{%
arr = [ 1, 2, 3 ];
obj = { foo: true, bar: false };
print([ ...arr, ...obj ], "\n");
%}
-- End --
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