Question

How can I assign the returned value of an anonymous function to a property of my JSON object?

Here’s my scenario:

            selectOptionData.push({
                value: 123,
                text: 'Hi there',
                selected: false,
                transportObject: function(){
                    var transObj = null;
                    $.each(transports, function(i, t)
                    {
                        if (t.ID == currentTranspObjID) {
                            transObj = t;
                            return;
                        }
                    });

                    return transObj;
                }
            });

Answer 1

First: You don’t have a JSON object. You have a normal JavaScript object defined with object literal notation.

I assume you want to execute the anonymous function immediately? Just add () after its body:

transportObject: (function(){
    var transObj = null;
    $.each(transports, function(i, t)
    {
        if (t.ID == currentTranspObjID) {
            transObj = t;
            return;
        }
     });
    return transObj;
}())  // <- see here

This is also called immediate function as you define and immediately execute it.