Class Delayer<T>

防抖式的执行任务

A helper to delay (debounce) execution of a task that is being requested often.

Following the throttler, now imagine the mail man wants to optimize the number of trips proactively. The trip itself can be long, so he decides not to make the trip as soon as a letter is submitted. Instead he waits a while, in case more letters are submitted. After said waiting period, if no letters were submitted, he decides to make the trip. Imagine that N more letters were submitted after the first one, all within a short period of time between each other. Even though N+1 submissions occurred, only 1 delivery was made.

The delayer offers this behavior via the trigger() method, into which both the task to be executed and the waiting period (delay) must be passed in as arguments. Following the example:

const delayer = new Delayer(WAITING_PERIOD);
const letters = [];

function letterReceived(l) {
  letters.push(l);
  delayer.trigger(() => { return makeTheTrip(); });
}
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