Learn Immutable, Ramda and Vim

Learn how you can use ramda.js to bring functional programming concepts into your JavaScript code. Ramda offers composability and immutability right out of the box, so you can leave your imperative code behind and build cleaner, more maintainable code.

A library designed specifically for a functional programming style, one that makes it easy to create functional pipelines, one that never mutates user data.

ramda

Functional Programming in JavaScript with Ramda.js

Vim is a highly configurable text editor built to make creating and changing any kind of text very efficient. It is included as "vi" with most UNIX systems and with Apple OS X.

Vim Videos for Beginners

Vim is a classic text editor that saw its first incarnation in 1976. Used around the world across most platforms, the ability to drop into a computer, open a command prompt and type `vim` is a simple yet powerful concept.

In this course we will take a tour of Vim, and learn the essentials you need to know to start being productive with this powerful text editor. We will learn about basic movement through a file in Vim without a mouse, loading and saving files, commanding the Vim editor, and get started customizing Vim to suit your needs.

Learn to Use VIM

im·mu·ta·ble i(m)ˈmyo͞odəb(ə)l/ adjective - **unchanging over time or unable to be changed**.

Mutating data is the source of never ending headaches in software systems, and JavaScript code is no exception. Immutable data structures, pure functions, uni-directional data flow... you've probably been hearing these terms.

Immutable.js provides us the data structures and utilities that we need to start introducing this powerful concept of immutability into our applications.

Immutable.js provides many Persistent Immutable data structures including: List, Stack, Map, OrderedMap, Set, OrderedSet and Record.

immutable

Learn how to use Immutable.js

In this lesson we'll see how to use the `without` function to remove items in a known list from an array. Then we'll generate our exclusion list and apply it to `without` using `reduce`, `min`, `max` and `converge` to detect the highest and lowest values in an array and creating a new array that excludes those values.

Discard the High and Low Values From an Array of Numbers with Ramda

React is one of the web’s most popular frameworks for building JavaScript applications. 

If you know what you’re doing, React can drastically simplify how you build, use, and maintain code.

Whether you’re a React newbie or you’re ready for advanced techniques, you can level-up with egghead. Explore our in-depth courses, lessons, and community resources to build more powerful applications and crack open your career.

react

Sometimes our update logic is asynchronous. In this lesson we will investigate two ways in which we can write asynchronous update logic. 

…But, we will also discuss why asynchronous producers should be avoided, and how that can be done by better separating our logic. 

This lesson also demonstrates the “createDraft” and “finishDraft” APIs

Write Asynchronous Producers in Immer and Why You Shouldn’t

In this lesson we will send patches over a WebSocket to our server, and distribute them again from there.

Create a Simple WebSocket Server to Distribute Patches from Immer

You can open files into Vim directly from the terminal. This works for both single files and multiple files. In addition to reading these files into buffers, you can open them as splits or tabs. This video covers the basics of opening files from the terminal…

Open Files into Vim from the Terminal as buffers, splits, and tabs

Create new files in Vim by creating a new buffer and writing it to disk.

The `:new` command is used — in normal mode — to create new buffers in horizontal splits.
As an alternative, `:vnew` can be used create new buffers in vertical splits.

Create New Files in Vim

Save files in Vim using the write `:write` command in normal mode.
This common command can be abbreviated `:w`.
Use it in tandem with `:q[uit]` to save and quit simultaneously: `:wq`.
The write command can be used with a bang (`!`) to write over read-only files — `:w!`.

Save Files in Vim with the Write Command

Use the edit command to open files in Vim's normal mode.

Type `:edit`, leave a space and hit `<tab>`.

This brings up a mini file explorer that can be navigated with `<tab>` or the arrow keys...

Open Files in Vim with the Edit Command

The version of Vim that comes with your operating system is out of date.
You can find download instructions at vim.org for all platforms.
However, the easiest way to get the latest Vim on a mac is with Homebrew…

Install the Latest Vim on a Mac with Homebrew

Quitting Vim is something that thousands of developers struggle with every day. Fortunately, for the astute, Vim tells us how to quit right on the launch screen.

Quitting Vim requires a mindset shift. Where most editors open in a persistent insert mode, Vim defaults default mode is different. It's known as normal mode and it allows you to type commands. Quit is one of those commands...

Launch and Quit Vim

Help is always at your fingertips in Vim.
Vim's documentation is built right into the editor.
Use the `:help` as a first line of defense before Stack Overflow or Google and you'll be able to spend more time in the editor.

Anything you can do in Vim has a really great `:help` doc...

Find Help in Vim

In this lesson we'll look at how you can use Ramda's `unfold` function to generate a list of values based on an initial seed.

Create an Array From a Seed Value with Ramda's unfold

The Vim editor is a text editor that lives inside of your terminal. Learn how to start Vim, and more importantly how to exit out of the editor! 

Intro to Vim

Learn how to efficiently move around Vim and stop reaching for your mouse

Moving around in Vim

Immutable.js offers methods to break  immutable structures into subsets much like Array--for instance it has the all powerful slice()--and unlike Array it offers functional methods like take() and skip(). You get the best of both the imperative and functional worlds.

Working with Subsets of an Immutable.js Map()

Equality checking deeply nested objects is painful. Fortunately Immutable.js makes this task easy with its .is() and .isSubset() methods. Let's see how we can take two different Immutable Maps() and check for equality.

Equality Checking with .is() and More

Immutable.js offers the fromJS() method to build immutable structures from objects and array. Objects are converted into maps. Arrays are converted into lists. The fromJS() method can also take a reviver function for custom conversions.

Using fromJS() to Convert Plain JavaScript Objects into Immutable Data

Understanding Immutable.js's Map() and List() structures will likely take you as far as you want to go with immutable programming. They have only small semantic differences between each other and the remaining structures in the Immutable.js family. Sequence, however, has one major difference: it's lazy--which opens a new realm of functional possibilities. Let's write a simple sequence to start.

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