How can I get the data outside the for loop or if condition when both for loop and if-condition is present inside the JavaScript function?

Question

Suppose,

below is my dummy code with my scenario:

Hello.js file:

function hello(data){
   var newlist = []

   if(something == true){
      for(let d in data){
          newlist.push([d[tag]])
          console.log("inside loop",newlist)   //here it is printing the newlist logs as for loop goes on.
      }
     console.log("outside loop",newlist)  //but it is not printing anything here
   }
   console.log(newlist)   //but it is not printing anything here also.
   return newlist         //also not returning the newlist.
}

Here, please help me with the solution for this issue or atleast if you can give any idea what exactly can be the issue.