Enter a number and the app will print all numbers from one to the number you choose, replacing those divisible by 3 with the word "ping" , those divisible by 5 with the word "pong", and those divisible by 15 with "ping-pong".

The objective of this exercise is to show how we can use Gulp to simplify our development and deployment process, optimize our code, and package it up in a format that the browser can understand.

You can find a full explanation on how to do this project in the Epicodus: Introduction to JavaScript course material. My implementation is slightly different, since I am using ES6 classes instead of functions and prototypes.