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- var arr1 = [1, 2, [3, 4]];
- arr1.flat();
- // [1, 2, 3, 4]
- var arr2 = [1, 2, [3, 4, [5, 6]]];
- arr2.flat();
- // [1, 2, 3, 4, [5, 6]]
- var arr3 = [1, 2, [3, 4, [5, 6]]];
- arr3.flat(2);
- // [1, 2, 3, 4, 5, 6]
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