asdrubal

A data collection module which keeps the last N datapoints and returns the distribution percentages of each value. It also supports data point expiration.

How to use it ?

const DataCollector = require('asdrubal');
const collector = new DataCollector({...opts});

// Add values to it
for (let x = 0; x < 3; x++)
  collector.add('likes_it');
for (let x = 0; x < 2; x++)
  collector.add('doesnt_like_it');

// Get raw number of occurrences
console.log(collector.occurrences());

// Get value distribution percentage
console.log(collector.percentages());

// Get a specific percentage
console.log(collector.percentageFor('likes_it'));

Supported options

These are the options which can be sent to the constructor:

• minDataPoints: The minimum number of data points to generate distribution percentages; If there are less datapoints than the value specified here, the percentages() and percentageFor() will return NOT_ENOUGH_DATAPOINTS or whathever the onNotEnoughDataPoints optional function returns;
• maxDataPoints: The number of datapoints after which they'll start to be dropped on add();
• dataTimeout: The datapoint timeout (in ms or undefined);
• onNotEnoughDataPoints: The function to call when there are not enough datapoints to generate percentages.