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Sebastian Sebastian
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Understanding JavaScript Prototypes - Workshop



The goal of this workshop is to help you understand the object model in Javascript by learning how prototypes work.

Most guides / tutorials start explaining JavaScript objects by going directly to ‘constructor functions’, this workshop is different, it starts simple by explaining prototype chains and building from there.

Please read the exercises thoroughly and follow all conditions, they are there to help you learn!

What you will learn

  • What are prototypes chains
  • Message delegation in a prototype chain
  • What are function constructors
  • What are function prototypes and how to work with them

Installation & Update

$ npm install -g planetproto@latest

Some npm installations require use of sudo in the above command. Recommend to instead reinstall node/npm so you don't need sudo.

Usage Instructions

1. Selecting a problem to work on

Once the workshop is installed, run planetproto to print a menu where you can select a problem to work on.

$ planetproto

Problems are listed in rough order of difficulty. You are advised to complete them in order, as later problems will build on skills developed by solving previous problems.

2. Writing your solution

Once you have selected a problem, the workshop will remember which problem you are working on. Using your preferred editor, simply create a file to write your solution in. Most problems will supply some boilerplate with which to get started.

Many challenges will ask you to make a 'claim'. We have provided claim as a global function. To make a claim write claim(actual, expected), e.g.:

claim(1 === 1, true);

3. Verifying your solution

Your solution will be verified against the output of the 'official' solution. If all of the output matches, then you have successfully solved the problem!

$ planetproto verify mysolution.js


Feedback and criticism is welcome, please log your troubles in issues.


Run node planetproto.js to run the workshop Run node planetproto.js verify 010.js to verify a submission

Thanks rvagg

This tutorial was built using rvagg's workshopper framework.



Robot designed by Ricardo Moreira from the Noun Project


Understanding JavaScript Prototypes - Workshop


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