created-at-data-converter

You want to see how your users have grown over time. The best way to represent is like:

You need to convert your user data (that has a created_at field) into:

• regularly spaced time intervals going from the smallest created_at value to the largest created_at value. This will be your x-axis data.
• a cumulative frequency data set that counts how many users were present at a given point in time.

That is what the created-at-data-converter function does!

Installation & use

npm install created-at-converter --save

Import created-at-converter into your javascript file:

var converterFunction = require('created-at-converter')

You can then use the converterFunction:

cumulativeCreatedAtData = converterFunction(data)

Input data format

Input data must be an array of objects. Each object must have a created_at entry e.g.

var data = [ { "id":1,"name":"Malik","created_at":"2016-06-15 12:17:25" }, { "id":2,"name":"Aliyah", "created_at":"2016-04-23 16:46:46"}, { "id":3,"name":"Sarah","created_at":"2016-10-29 13:15:41"} ];

Output data format

After calling the converterFunction like so:

outputData = converterFunction(data)

Your output will look like:

outputData = { xVals: [ 'Apr 23rd 16', 'Jul 27th 16', 'Oct 29th 16' ], yVals: [ 0, 2, 2 ] }

• The xVals are equally spaced time intervals going from the earliest created_at to the biggest created_at.
• The yVals represent how many user accounts had been created at that point in time.

Use with Chart.js

I built this package so I could send the output data straight into chart.js (http://www.chartjs.org/docs/).

Set

data: outputData.yVal,

And

labels: outputData.xVal