Node News Friday, June 15

How to create Safari plugin

  • Step 3: Create the Global Page – – To control our button, we need to have a script, and for that, we need to have an HTML file to load the script.
  • In Extension Builder, find the Global Page File setting and select the file you created from the dropdown menu.
  • When our button is clicked, safari sends a command event, which is called open- – nettuts, as we set in Extension Builder.
  • Now we need to implement the function performCommand to respond appropriately when our button is clicked: – – // Function to perform when event is received – Function performCommand(event) { – // Make sure event comes from the button if(event.command == open-nettuts) { – // This is where we finally…
  • Your global page should look like this now: – – script – // Set up the Listener – performCommand, false); – – // Function to perform when event is received – function performCommand(event) { – // Make sure event comes from the button – if (event.command == open-nettuts) { -…

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How to create Safari plugin

JavaScript engine fundamentals: Shapes and Inline Caches · Mathias Bynens

  • Weve just highlighted the main differences in the interpreter and optimizing compiler pipelines for each JavaScript engine.
  • For example, how do JavaScript engines implement the JavaScript object model, and which tricks do they use to speed up accessing properties on JavaScript objects?
  • Its also very common to access the same property on objects with the same shape: – – With that in mind, JavaScript engines can optimize object property access based on the objects shape.
  • The next statement adds a property with a value to this object, so the JavaScript engine transitions to a shape that contains the property and a value is added to the at the first offset .
  • To make this work, every links back to its previous shape: – – If you write in your JavaScript code, the JavaScript engine looks up the property by walking up the transition chain until it finds the that introduced property .

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JavaScript engine fundamentals: Shapes and Inline Caches · Mathias Bynens

Build a Node.js command-line chat application with Chatkit

  • In the same project, install @pusher/chatkit and jsdom: – npm install –save @pusher/chatkit – npm install –save jsdomTo be clear, in the previous step, we installed the Chatkit server SDK (@pusher/chatkit-server) and here, we install the client Chatkit SDK (@pusher/chatkit-client).
  • Create auser – Before connecting to Chatkit, we must first create a Chatkit user via the server we wrote earlier.
  • To do this, well send a request to the /users route using axios, which is a HTTP client: – npm install –save axiosAfter installing axios, import it: – Then, define a function called createUser: – We can now call this function with the prompted username: – Lets test this out….
  • To do this, we should update the main function in client.js to fetch joinable rooms (getJoinableRooms), and list them alongside the rooms a user has already joined (user.rooms): – The… syntax there is called destructuring, and it provides a succinct way to merge two or more arrays.
  • First, install readline to read input from the user: – npm install –save readlineThen, import it: – Finally, reference it below: – If you run two instances of the client, you should be able to send and receive messages:

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Build a Node.js command-line chat application with Chatkit

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