txiki.js: A Small and Powerful JavaScript Runtime

txiki.js — The tiny JavaScript runtime

Overview

txikia (basque): small, tiny.

txiki.js is a small and powerful JavaScript runtime. It's built on the shoulders of giants: it uses QuickJS as its JavaScript engine and libuv as the platform layer.

It was formerly named quv.

Features

Browser-like APIs

  • Console API
  • URL & URLSearchParams
  • TextEncoder / TextDecoder APIs
  • EventTarget / Event / CustomEvent
  • XMLHttpRequest & fetch (including AbortController)
  • Performance API
  • Worker API
  • Crypto API (just getRandomValues)
  • WebAssembly (no tables, globals or memory support yet)

Custom features

  • TCP and UDP sockets
  • TTY handles
  • Unix sockets / named pipes
  • Timers
  • Signals
  • File operations
  • Event loop
  • High-resolution time
  • Miscellaneous utility functions
  • Worker threads
  • Child processes
  • DNS (getaddrinfo)
  • WASI (no memory support yet)

See the full API.

Other extras:

  • Import directly from HTTP(S) URLs
  • Import JSON files
  • path module
  • uuid module
  • hashlib module
  • BigFloat and BigDecimal extensions

Supported platforms

  • GNU/Linux
  • macOS
  • Windows (experimental)
  • Other Unixes (please test!)

Building

CMake is necessary.

# Get the code
git clone --recursive https://github.com/saghul/txiki.js --shallow-submodules && cd txiki.js
# Compile it!
make
# Run the REPL
./build/tjs

NOTE: The txiki.js build depends on a number of git submodules (e.g. curl, libuv). If you didn't already clone this repository recursively, make sure you initialize these submodules with git submodule update --init before proceeding to the build.

Thanks

txiki.js stands on shoulders of giants. It wouldn't be what it is today without these libraries:

In addition, txiki.js has these contributors to thank for their help.

Thank you all for making this project possible!

Download Details:

Author: saghul
Download Link: Download The Source Code
Official Website: https://github.com/saghul/txiki.js
License:  MIT

#javascript

What is GEEK

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txiki.js: A Small and Powerful JavaScript Runtime

Ajay Kapoor

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Grokking Call(), Apply() and Bind() Methods in JavaScript

These functions are very important for every JavaScript Developer and are used in almost every JavaScript Library or Framework. Check out the code snippet below.

Taken from the very popular library Lodash

/**
	* Creates a function that invokes `func` with arguments reversed.
	*
	* @since 4.0.0
	* @category Function
	* @param {Function} func The function to flip arguments for.
	* @returns {Function} Returns the new flipped function.
	* @see reverse
	* @example
	*
	* const flipped = flip((...args) => args)
	*
	* flipped('a', 'b', 'c', 'd')
	* // => ['d', 'c', 'b', 'a']
	*/
	function flip(func) {
	  if (typeof func !== 'function') {
	    throw new TypeError('Expected a function')
	  }
	  return function(...args) {
	    return func.apply(this, args.reverse())
	  }
	}

	export default flip

Look at the statement on line 21, return func.apply(this, args.reverse())

In this article, we will have a look at the call()apply() and bind() methods of JavaScript. Basically these 3 methods are used to control the invocation of the function. The call() and apply() were introduced in ECMAScript 3 while bind() was added as a part of ECMAScript 5.

Let us start with an example to understand these.

Suppose you are a student of X university and your professor has asked you to create a math library, for an assignment, which calculates the area of a circle.

const calcArea = {
	  pi: 3.14,
	  area: function(r) {
	    return this.pi * r * r;
	  }
	}

calcArea.area(4); // prints 50.24


You test this and verify its result, it is working fine and you upload the library to portal way before the deadline ends. Then you ask your classmates to test and verify as well, you come to know that that your result and their results mismatches the decimals precision. You check the assignment guidelines, Oh no! The professor asked you to use a constant **pi** with 5 decimals precision. But you used **3.14** and not **3.14159** as the value of pi. Now you cannot re-upload the library as the deadline date was already over. In this situation, **call()** function will save you.

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What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");
</script>

How to comment JavaScript code?

  • For single line comment in JavaScript we have to use // (double slashes)
  • For multiple line comments we have to use / * – – * /
<script type="text/javascript">

//single line comment

/* document.write("Hello"); */

</script>

Advantages and Disadvantages of JavaScript

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