How to acquire the returned value of a function in another function?

Question

I have been trying to acquire the returned value from the function into another function. Can you please help me out?

updateArticleSeqNumber: function() {
  var articleSequenceId;
  var spreadObj = this.moveSpreadDetailDlg.getModel().getData();
  var entityName = "/PIMArticleSequenceSet(Name='" + encodeURIComponent(this.oCurrentScenario.Name) + "',Template='" + encodeURIComponent(this.oCurrentScenario.Template) + "',Region='" + this.oCurrentScenario.Region + "',Article='"+spreadObj.Article+"',Spread='" + spreadObj.Spread + "',PimPage='" + spreadObj.ArticleMoveTo + "')";
  sap.ui.getCore().getModel().read(entityName,{
    async: true,
    success: jQuery.proxy(function (oData) {
      articleSequenceId = oData.ArticleSequenceId;
      articleSequenceId+=1;
    })
  });
  return articleSequenceId;
}

The returned value is articleSequenceId.

The another function I need to use that is

saveSpreadDetailMoveChange: function() {
  var updateArticleSeqId= this.updateArticleSeqNumber();
}

I am not getting the value in updateArticleSeqId.

Please point me in the right direction.