Web Reality

js interview series

𝒒1. 𝒘𝒉𝒂𝒕 𝒊𝒔 𝒏𝒐𝒅𝒆 𝒋𝒔 ?

Node.js is an open-source, cross-platform, back-end JavaScript 𝑟𝑢𝑛𝑡𝑖𝑚𝑒 𝑒𝑛𝑣𝑖𝑟𝑜𝑛𝑚𝑒𝑛𝑡 that runs on the 𝐶ℎ𝑟𝑜𝑚𝑒 𝑣8 𝑒𝑛𝑔𝑖𝑛𝑒 using c++. and executes JavaScript code outside a web browser.

As a 𝑛𝑜𝑛-𝑏𝑙𝑜𝑐𝑘𝑖𝑛𝑔(𝑎𝑠𝑦𝑛𝑐ℎ𝑟𝑜𝑛𝑜𝑢𝑠) 𝐼/𝑂 and 𝑒𝑣𝑒𝑛𝑡-𝑑𝑟𝑖𝑣𝑒𝑛 JavaScript runtime, Node.js is designed to build scalable network applications.

Javascript was always a client side language until node.js launched on 2009 and it allows developers to write JavaScript code that runs directly in a computer process itself instead of in a browser. and thus it can be used to write server-side applications with access to the operating system, file system, and everything else required to build fully-functional applications.

𝒒2. 𝒘𝒉𝒂𝒕 𝒊𝒔 𝒓𝒖𝒏𝒕𝒊𝒎𝒆 𝒆𝒏𝒗𝒊𝒓𝒐𝒏𝒎𝒆𝒏𝒕?

A runtime environment refers to the specific context or set of conditions in which a program or software application executes or runs.

primarily as a client side language, browsers runtime environment was used to execute js code before node js arrived. Arrival of node js , make possible to run js code out of browsers context.

𝒒3. 𝑾𝒉𝒚 𝒘𝒆 𝒏𝒆𝒆𝒅 𝒓𝒖𝒏𝒕𝒊𝒎𝒆 𝒆𝒏𝒗𝒊𝒓𝒐𝒏𝒎𝒆𝒏𝒕?

Runtime environment not only just execute programming files, but also provides interface between hardware and program that is executed inside environment.

In order to operate our program into different OS, we need to make many versions of codes that is executable for each OS. However thanks to runtime environment, we can use one program into other OS.

For example, we can use program that is written in javascript on IOS, Linux, Windows, etc.

𝒄𝒐𝒎𝒎𝒊𝒏𝒈 𝒖𝒑 𝒏𝒆𝒙𝒕: v8 engine, non-blocking I/O, event-driven

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