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The differences between Web 2.0 and Web 3.0
The future of the internet
Understanding the potential of Web 3.0
Events
Something that has happened in our app that we can respond to. There are two types of events in Node.
- System Events: C++ core from a library called libuv..
- Custom Events: JavaScript core.
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The JavaScript event loop
Otherwise, here’s a quick step-by-step explanation of how the JavaScript Event Loop works.
- Push main() onto the call stack.
- Push console.log onto the call stack. This then runs right away and gets popped.
- Push Settimeout onto the stack. Settimeout is a Node API. ...
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Node Modules
A Node module is a reusable block of code whose existence does not accidentally impact other code.
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Require
Require does three things:
- It loads modules that come bundled with Node.js like file system and HTTP from the Node.js API .
- It loads third-party libraries like Express and Mongoose that you install from npm.
- It lets you require your own files and modularize the proje...
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Why Node.js?
Node.js is a Javascript Runtime built on chrome’s V8 Javascript engine. It uses an event-driven, Non-Blocking I/O model that makes it lightweight and efficient. It can be anything ranging from Reading/Writing local files to making an Http request to an API. I/o takes time and hence blocks other f...
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Non-blocking I/O
On the other hand, using a non-blocking request, you can initiate a data request for user2 without waiting for the response to the request for user1. You can initiate both requests in parallel.
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Blocking I/O
In the blocking method, user2's data request is not initiated until user1's data is printed to the screen.
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npm
These are libraries built by the awesome community which will solve most of your generic problems. npm (Node package manager) has packages you can use in your apps to make your development faster and efficient.
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Understanding Dynamic Systems
A dynamic system has two types of feedback loops:
- Positive Feedback: This feedback loop keeps the coveted effect in progress.
- Balancing Feedback: Also called negative feedback, this loop keeps the system in a balanced state.
In...
Performance and scale
- Each Frontend node handles 100k persistent connections. It handles only this many connections because the server is doing a lot of work processing multiple types of data (likes, comments, instant messaging etc.).
- Each Dispatcher can publish 5k events per seco...
The conjunctive events bias
We often overestimate the likelihood of events that must happen in conjunction with one another.
We are optimistic in our estimation of the cost and schedule and surprised when something inevitably goes wrong.
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