Javascript function always returns null

Question

I am newbie to the JavaScript world. I have a doubt how the return statement works in JavaScript.

What I am trying to do is to have a function pass one arguments

Answer 1

There are a few issues with your approach:

1. The inner function you defined is returning to $.each, not to the outer function, so you never get that value.
2. You don't need to iterate over the object in the wild way you are. Objects in Javascript are hash tables, you can simply do the following

:

function exampleFunction(param) {
    return exampleData[param];
}

If exampleData[param] is undefined, it will return undefined, otherwise, it will return the value stored there.

If you absolutely need the undefined case to return null instead of undefined, then it becomes a bit more complicated.

function exampleFunction(param) {
    if(exampleData.hasOwnProperty(param) {
        return exampleData[param];
    } else {
        return null;
    }
}