Simple Promise Delay

In JavaScript, it is fairly standard to use things like setTimout(fn, 500) to do a delay and then run a function. This does not use the Promise pattern which is becoming the dominant pattern for handling asynchronous programming (at least until await, async replace it a few years down the road). So I will write some quick code to do a simple wait.

function wait(duration) {
    return new Promise((resolve, reject) => {
        setTimeout(resolve, duration)
    })
}

This makes some nice looking code like: 

wait(5000).then(doStuff);

This is also the basic example on MSDN for Promises.

This is nice because it separates control flow from parameters.