JavaScript: Equivalent of arrow function (how to not use an arrow)

Question

I am new to JavaScript, and I am struggling with how to change an arrow function with non-arrow function... Please help, and thank you very much in advance!

this.middleware(req,res,()=>{
    this.processRoutes(req,res);
});

Answer 1

This is how you can do it.

this.middleware = function(req,res) {
  this.processRoutes(req,res);
};

However you should use arrow function unless you have any specific reason for not to use it.