batch-array

batch-array

A simple library to handle batching up an array before calling a function with it. Each call to batcher.push(item) adds an item to the current batch. After batchInterval, batchFn is called with an array of the items pushed.

npm install batch-array

Usage

var BatchArray = require('batch-array');
var myBatcher = new BatchArray({
  batchFn: handleBatch,
  batchInterval: 1000
});

function handleBatch(batch, cb) {
  console.log(batch);
  return cb();
}

myBatcher.push('a');
myBatcher.push('b');

setTimeout(function() {
  myBatcher.push('c');
  myBatcher.push('d');
}, 1500);

setTimeout(function() {
  myBatcher.push('e');
  myBatcher.push('f');
  myBatcher.flush();
}, 2500);

// OUTPUT
['a', 'b'] // at 1000ms elapsed
['c', 'd'] // at 2000ms elapsed
['e', 'f'] // at 2500ms elapsed
[] // at 3500ms elapsed

Interface

var myBatcher = new BatchArray(options) options.batchFn { function(batch, cb) | required } - function to be called on an interval with the batch and a callback. options.batchInterval { number | required } - interval in ms to call the batch function with the batched arguments.

myBatcher.push(item) - pushes an item into the current batch. myBatcher.flush(cb) - causes an immediate call to the batch function and resets the batchInterval, "flushing" out the current batch. Callback is passed to the batch function. myBatcher.startInterval() - starts the batch interval. Automatically called upon creating a batch object. myBatcher.stopInterval() - stops the batch interval