MaxInterview - javascript array flat

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1let arr = [
2    [1, 2],
3    [3, 4],
4    [5, 6][7, 8, 9],
5    [10, 11, 12, 13, 14, 15]
6];
7let flatArray = arr.reduce((acc, curVal) => {
8    return acc.concat(curVal)
9}, []);
10
11//Output:  [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 ]

1// flat(depth), 
2// depth is optional: how deep a nested array structure 
3//		should be flattened.
4//		default value of depth is 1 
5
6const arr1 = [1, 2, [3, 4]];
7arr1.flat(); 
8// [1, 2, 3, 4]
9
10const arr2 = [1, 2, [3, 4, [5, 6]]];
11arr2.flat();
12// [1, 2, 3, 4, [5, 6]]
13
14const arr3 = [1, 2, [3, 4, [5, 6]]];
15arr3.flat(2);
16// [1, 2, 3, 4, 5, 6]
17
18const arr4 = [1, 2, [3, 4, [5, 6, [7, 8, [9, 10]]]]];
19arr4.flat(Infinity);
20// [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

1const arr1 = [1, 2, [3, 4]];
2arr1.flat(); 
3// [1, 2, 3, 4]

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