let flattenObj = function(inputObject) {
  let flattenedObj = {};
  
  for (let obj in inputObject) {
    if (inputObject[obj].constructor === Object) {
      let flatObj = flattenObj(inputObject[obj]);
      
      for(let i in flatObj) {
        flattenedObj[i] = flatObj[i];
      }
    } else {
      flattenedObj[obj] = inputObject[obj]
    }
  }
  
  return flattenedObj;
}


let obj = {
		name: 'Sonit',
		address: {
			phone: '123123123',
			contact: {
				email: 'sonit.bhaker@gmail.com'
			},
			age: {
				a: {
					b: {
						c: {
							d: {
								e: {
									val: 3
								}
							}
						}
					}
				}
			}
		}
	};


console.log(flattenObj(obj));


// flatten nested array
let flattenArr = function(inputArr) {
  console.log('inputArr: ', inputArr);
  let flattenedArr = [];
  
  for(let arr of inputArr) {
    if (arr.constructor === Array) {
      let flatArr = flattenArr(arr);
      
      for(let i of flatArr) {
        flattenedArr.push(i)
      }
    } else {
      flattenedArr.push(arr)
    }
  }
  
  return flattenedArr;
}


const arr = [1,[2,3,[4,5,[6,78,[11], 12], 22, 11], 1], 12, 11, 1234, [22,[33,[44]]]];


console.log(flattenArr(arr));