Differences between TypeScript and JavaScript

Small compering of two programming languages with code examples
21 August 2017   2576

TypeScript is a superset of JavaScript which primarily provides optional static typing, classes and interfaces. One of the big benefits is to enable IDEs to provide a richer environment for spotting common errors as you type the code.

Code examples


class Greeter {
    greeting: string;
    constructor (message: string) {
        this.greeting = message;
    greet() {
        return "Hello, " + this.greeting;


var Greeter = (function () {
    function Greeter(message) {
        this.greeting = message;
    Greeter.prototype.greet = function () {
        return "Hello, " + this.greeting;
    return Greeter;

Notice how the TypeScript defines the type of member variables and class method parameters. This is removed when translating to JavaScript, but used by the IDE and compiler to spot errors, like passing a numeric type to the constructor.

It's also capable of inferring types which aren't explicitly declared, for example, it would determine the greet() method returns a string.

What is Vim.Wasm?

Small introduction to Vim port to WebAssembly with screenshot and developer notes
16 July 2018   69

Vim.wasm is experimental fork of Vim editor to compile it into WebAssembly using emscripten and binaryen.

Developer added some notices:

  • Please access from a desktop browser (Chrome/Firefox/Safari/Edge). Safari seems the best on macOS.
  • Please avoid mobile networks. Your browser will fetch some large files (up to 2.5MB).
  • vim.wasm takes key inputs from DOM keydown event. Please disable your browser extensions which affect key inputs (incognito mode would be the best).
  • This project is very early phase of experiment. Currently only tiny features are supported. More features will be implemented (please see TODO section). And you may notice soon on trying it... it's buggy :)
  • If inputting something does not change anything, please try to click somewhere in the page. Vim may have lost the focus.

The goal of this project is running Vim editor on browser by compiling Vim C sources into WebAssembly. 

Vim.wasm screenshot
Vim.wasm screenshot 

WebAssembly frontend for Vim is implemented as a new GUI frontend. C sources are compiled to each LLVM bitcode files and then they are linked to one bitcode file vim.bc by emccemcc finally compiles the vim.bc into vim.wasm binary using binaryen and generates HTML/JavaScript runtime.

You can find more info at GitHub.