Глубокий поиск / BasicQual#1

deepSearch.js

function deepSearch(array, number) {
  if (Array.isArray(array)){
    return array.some(function search(value) {
      if (value === number) {
        return true;
      } else if (Array.isArray(value)) {
        return value.some(search);
      } else {
        return false;
      }
    });
  } else {
    console.log(array +' is not array!');
    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, 4, 9, [3, 7, [22, [23]], 4, 5], 17], 8));
//false
console.log(deepSearch([1, 2, [3, 7, [22, [23]], 4, 5], 17], 7));
//true
console.log(deepSearch(2, 7));
//false