How can I flatten a nested array in JavaScript?

How can I flatten a nested array in JavaScript?

You can use the flat() method in JavaScript to flatten nested arrays. For example, array.flat() will flatten one level deep.

What if I have multiple levels of nesting?

You can pass a depth argument to the flat() method, like array.flat(2) to flatten two levels deep.

Is there a way to flatten it without using flat()?

Yes! You can use reduce() and concat() to flatten an array. For example: array.reduce((acc, val) => acc.concat(val), []).

Can you show me an example with code?

Sure! Here's an example:

const nestedArray = [1, [2, [3, 4]], 5];
const flattened = nestedArray.flat(2);
console.log(flattened); // Output: [1, 2, 3, 4, 5]