Front-End Web Development: The Big Nerd Ranch Guide

Formatting and Updating Message Timestamps

Your messages have timestamps that are not very human-friendly. (Seriously, who tells time by the number of milliseconds since January 1, 1970?) To provide nicer timestamps (such as “10 minutes ago”), you will add a module called moment. Install it using npm and save it as a development dependency:

npm install --save-dev moment

Each of your messages stores its timestamp as a data attribute. Write an init method for ChatList that calls the built-in function setInterval, which takes two arguments: a function to run and how often that function should be run. Your function will update each message with a human-readable timestamp.

To set the timestamp string, use jQuery in dom.js to find all ...