Several Ali pen questions

1.

 var  data = {a:  1 b:  2 3, D:  4 Span style= "color: #000000;"   >   };  var  result = Object.keys (data). Filter ( function   (x) { return  D                ATA[X] > 2;   });  Console.log (result); //["C", "D"] 
 
/* 
 Explanation: Object.keys () outputs an enumerable property name as an array, object.keys (data) returns an array of ["A", "B", "C", "D"]  
 Filter () arrays that are an iterative method that runs the given function for each item in a group, and returns the number of items that the function returns True. , 
 namely: function (item, index, array) 
 */

2. Creation of objects to be examined

  function  obj (name) {       if  (name) {           returnnew  obj (name);       }          }   Obj.prototype.name  = "name2";    var a = obj ("name1");    var New obj;   Console.log (a.name);   // "Name1"   Console.log (b.name);  // "Name2"

3. Fibonacci Sequence

   function  Getnthfibonacci (count) {      if(Count < 2) {         return 1;       Else {         return Arguments.callee (count-1) + Arguments.callee (count-2// Use Arguments.callee to disassociate the function from the name of the functor      }   }   Console.log (Getnthfibonacci (0));  // 1   Console.log (Getnthfibonacci (4));  // 5

Several Ali pen questions