Bringing Python Lists to JavaScript with Proxy API

Bringing Python Lists to JavaScript with Proxy API

Bringing Python Lists to JavaScript With Proxy API. How to use JavaScript Proxy API to create a Python-like list object with slicing and negative indexing. What is a JavaScript proxies. Target: the object we want to proxy. We will use Proxy API to create a Python-like list in JavaScript.

How to use JavaScript Proxy API to create a Python-like list object with slicing and negative indexing.

JavaScript Proxy API is often portrayed as “an advanced concept” and this discourages many beginners (and even intermediates) from delving into this topic.

In reality, it’s not so hard to understand the basics of it. Once you get it, you’ll have a new powerful weapon in your arsenal. You can use it for data validation, operator overloading, auto-fixing inputs, logging, and a lot more. Popular libraries like  Vue.js and  MobX take advantage of Proxy API to create reactive objects.

In this article, I want to use a simple and fun example to introduce you to Proxies and their basic mechanism.

What is a JavaScript Proxy

Proxy APIs were introduced in 2015 with ES6. A Proxy enables you to create a wrapper for another object, which can intercept and redefine fundamental operations for that object.

The 3 key terms to understand are:

  • Traps: the methods we can override;
  • Handler: the object that wraps all our traps;
  • Target: the object we want to proxy.

The Proxy object constructor takes two arguments: the target and the handler.

What We Will Do

We will use Proxy API to create a Python-like list in JavaScript. In detail, we’ll focus on two great features of Python lists: negative indexing and slicing.

If you’re not familiar with Python, in the following section I’ll give you a quick refresh on these two features.

BEWARE: You’re going to see a few lines of Python. Don’t panic ;)

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