Question

There are many JavaScript functions out there that accept an object directly here are some examples. This is isn’t specific to either of these functions jquery’s $.ajax() or the nodejs module request(), both are just examples.

$.ajax({
  method: "post",
  data: {'hello':'world'},
})

request({
  method : "post",
  body : "hello world",
});

I just tried something that I thought would work and it was a more elaborate version of this.

request({
  method : function(){
    return "post";
  },
  data: {'hello':'world'},
});

To my surprise it didn’t work. Neither does this.

var m = function(){
  return "post";
};

request({
  method : m,
  data: {'hello':'world'},
});

Am I missing something? Is there some way to get a generated function into these objects? I’d love some feedback.

Answer 1

You don’t want to pass a function here, you want to pass its return value.

request({
  method: (function() {
    return "post";
  })(),
  data: {'hello':'world'}
});