To convert the nested array arr to a flat array, you can use the Array.prototype.flat() method. This method creates a new array with all sub-array elements concatenated into it recursively up to the specified depth. If no depth is provided, the default depth is 1.
var arr= [[1,2],[3,[2]],[[2,5,[4]]]];
var flatArr = arr.flat(3);
console.log(flatArr);
Output:
[1, 2, 3, 2, 2, 5, 4]
The resulting flatArr contains all the elements from the original nested arr array in a flat structure.
