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function deepSearch(arr, num) {
  for (var el in arr) {
    if (Array.isArray(arr[el])) {
      if (deepSearch(arr[el], num))
        return true;
    }
      
    if (arr[el] === num)
      return true;
  }
  
  return false;  
}
console.log(deepSearch([1, 2, 3, 4, 5], 3));
// true
console.log(deepSearch([1, 2, 3, 4, 5], 8));
// false
console.log(deepSearch([1, 2, [3, 7, [22, [23]], 4, 5], 17], 8));
// false
console.log(deepSearch([1, 2, [3, 7, [22, [23]], 4, 5], 17], 7));
// true
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xsoulfulxpro
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