Рекурсия
IntuitionApproachComplexity
Time complexity:

Space complexity:
Code
# Intuition
<!-- Describe your first thoughts on how to solve this problem. -->

# Approach
<!-- Describe your approach to solving the problem. -->

# Complexity
- Time complexity:
<!-- Add your time complexity here, e.g. $$O(n)$$ -->

- Space complexity:
<!-- Add your space complexity here, e.g. $$O(n)$$ -->

# Code
```javascript []
var flat = function (arr, n) {
    if(n == 0 || arr.every(el => typeof el === 'number')) return arr;

    let res = [];
    for(let i=0;i<arr.length;i++) {
        if(Array.isArray(arr[i])) {
            res.push(...flat(arr[i], n-1));
        } else res.push(arr[i]);
    }
    return res;
};
```
['JavaScript']