The flat() method in Javascript creates a new array with all the sub-array elements concatenated into it recursively up to a specified depth. If no depth is provided, it defaults to 1.
Here's an example:
const nestedArray = [1, 2, [3, 4, [5, 6]]];
// Using flat() with default depth (1)
const flattenedArray = nestedArray.flat();
console.log(flattenedArray);
// Output: [1, 2, 3, 4, [5, 6]]
// Using flat() with depth 2
const doublyFlattenedArray = nestedArray.flat(2);
console.log(doublyFlattenedArray);
// Output: [1, 2, 3, 4, 5, 6]
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