Answer to Question #310818 in Java | JSP | JSF for sai

Question

Let variable = [1, [2], [[3]],[[[4]]]]

Output should be: [1, 2, 3, 4]

Dont use flatten function.

Use for loop

Answer 1

function flattenArray(arr) {
  var result = [];
  
  for( var i=0; i<arr.length; ++i) {
    if (typeof arr[i] === 'number') {
      result.push(arr[i]);
    }
    else {
      result = result.concat(flattenArray(arr[i]));
    }
  }
  
  return result;
}