In JavaScript, utilize an object that is defined outside of a function

Here is a JavaScript function I have:

function status(){
  this.functionA = function(){}
  //Other functions and fields go here
}

Now, there is another function as well:

function create(root){
var server = library(function (port) {
  //Additional functions here
});
var returnValue = {
  current:status(),
  cur:function(port){
    current.functionA();
  }}
return returnValue;
}

Whenever I try to call current.functionA(), it shows an error saying that current is undefined. How can I successfully call functionA()?

Answer №1

When dealing with a function-constructor such as status(), it is necessary to use the new keyword when calling it. I have made some modifications to your code snippet below.

var returnValue = {
  current: new status(),
  cur:function(port){
    current.functionA();
  }}
return returnValue;
}

It's worth noting that create() behaves differently in that it does not require the new keyword since it is creating and returning an object within the function itself.

Answer №2

function status(){
  this.functionA = function(){alert("functionA");}
}
function createInstance(root){ 
    var result = {
        current:status.call(result), 
        cur:function(port){ this.functionA(); }.bind(result)
    } 
    return result; 
}
createInstance().cur(123);

I resolved the issue by utilizing the "call" and "bind" methods from JavaScript's Function prototype.

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