Question

I have this function in JS:

 function redGet(key){
    var response;
    red.get(key, function (err, reply) {
            response = reply;
        });
    return response;
    }

This keeps returning undefined on :

console.log(redGet("hello"));

Answer 1

Assuming that red.get() is an AJAX-like asynchronous function, the problem is that you’re expecting it to operate synchronously. You won’t be able to get the reply value until the asynchronous operation is complete, which means that anything that relies on this value must be invoked in the callback function.

For example:

function redGet(key){
    red.get(key, function (err, reply) {
        // do whatever you need to do with the reply value here
        console.log(reply);
    });
}

redGet("hello");