const array = [1, [2, [3, 4, [5, 6]]], 7];
console.log(array.flat(1)); // [ 1, 2, [ 3, 4, [ 5, 6 ] ], 7 ]
console.log(array.flat(2)); // [ 1, 2, 3, 4, [ 5, 6 ], 7 ]
console.log(array.flat(3)); // [ 1, 2, 3, 4, 5, 6, 7 ]
.flat() (ES2019) will flatten an array up to the given depth level.
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