# Javascript

*JavaScript* was initially created to “make web pages alive”.

The programs in this language are called *scripts*. They can be written right in a web page’s HTML and run automatically as the page loads.

Scripts are provided and executed as plain text. They don’t need special preparation or compilation to run.

## **Utilities**

In single line of code! No more! - \[<https://1loc.dev/]\\(https://1loc.dev/]\\(https://1loc.dev/)>

Compatibility table - \[<https://kangax.github.io/compat-table/es6/]]\\(https://kangax.github.io/compat-table/es6/>])

Run a local web server to run JS modules

```js
# Step 1: Install http-server package 
npm install http-server -g 

# Navigate to the directory 
$ cd /opt/sites/blog 

# Launch HTTP server 
$ http-server 

# Launch HTTP server on port 4000 
$ http-server -p 4000
```

### Concepts

* [Higher Order Function](https://dev.to/atapas/higher-order-functionshof-in-javascript-explain-like-im-five-402f)
  * Composability: function inside a function - that is called functional programming to take the advantage of reusability, less code, etc.,
  * JS high-order function: .map(), .filter(), .reduce(), .find()
  * Higher order functions is not same as callback. Pass as an argument to higher-order function.
* [Debounce](https://www.logeshpaul.com/wiki/code/what-is-debounce)