7/19/20 by DW

Dave Winer asked about simplifying such JavaScript code, used a lot for callbacks:

if (callback !== undefined) {
    callback ();
}

Here's a suggestion. Processing could be moved to a helper function, shortening the call:

function callbackIf (
    cb
) {
    if (cb !== undefined) cb()
}

// Usage
callbackIf(callback)

To pass data to the callback I would extend the helper to accept a variable number of arguments and pass them through:

function callbackIf (
       cb,
    ...args
) {
    if (cb !== undefined) cb(...args)
}

// Usage
callbackIf(callback)
callbackIf(callback, 'Hi', 'there')