YS — YAML Done Wisely

My friend Vadim Bauer filed this GitHub issue for the helm-unittest project, to DRY (don't repeat yourself) out some of the repetitive test data.

When I started the Summer of YS blog series on June 1st, I committed to writing a blog post every day until September 1st (92 days in a row).

The looping function that offers the most control in YS is called loop.

YS (being Clojure) is a functional language with immutable data structures and lazy evaluation.

YAML is a superset of JSON.

Last Friday we got a YS program running on Go using Glojure.

Let's do a Fun FridaYS post on Sunday.

The term "YAML Schema" is a bit of unfortunate history.

Yesterday I hinted at the idea of YS hosted on Go.

So YS compiles to Clojure.

We've seen before that YS can work with YAML files that contain multiple documents.

Today I met Mike Farah, the creator of yq!

Wouldn't it be handy to get data from shell commands in YAML?

YAML has a Core Development Team of five people that I am a member of.

Did you know that in YAML you can write: yaml ?

On Friday June 27th we found a task on Rosetta Code and converted the Clojure solution to YS.

What is the syntax for comments in YS?

I'll say it again.

In functional programming, currying is a technique where a function that takes multiple arguments is called with fewer arguments than it takes and returns a function that takes the remaining arguments.

I've said it before, but YS code is 100% valid YAML.

Yesterday we talked about writing tests in YS.

YS is a great language for writing tests in.

YS is a YAML loader module.

Try running these commands on Linux or Mac: bash git clone https://github.com/yaml/yamlscript cd yamlscript make install Chances are that everything will just work.

We've seen different ways to call YS functions in YAML.

The current version of YS as of today is 0.2.1.

Reusing code is the cornerstone of good programming.

All modern programming languages have regular expressions.

Yesterday I showed you a FizzBuzz solution in YS.

Last week I told you about YS on Rosetta Code and yesterday I told you about YS on Exercism.

Ever heard of a YS Exorcism?!

We know that YS is made from Clojure and the Clojure is made from Java.

Today I'd like to show you why I love how YS handles symbols.

From the start, YAML has always been about making data clean and easy to read.

Or better yet...

Yesterday we wrote a YS program by porting a Clojure program from Rosetta Code.

It's Friday and I feel like having some fun.

I've mentioned YS "modes" in passing several times in this series.

Yesterday we learned that all YS YAML input compiles to Clojure (Lisp) before being evaluated by a native binary Clojure interpreter runtime.

What if I told you that...

There's almost nothing I like more about programming than one liners.

Yesterday we started learning about the ys CLI and there's a lot more cool stuff to learn about it.

There are different ways to use YS but the most common is to use it via the YS command-line tool: ys; a very versatile tool indeed.

Do you know how a YS assignment actually works?

Yesterday we looked at the cond and case functions.

Most languages support a case or switch construct which is a way to handle multiple conditions.

Yesterday we mentioned the when function as an alternative to if.

Yesterday we talked about if being a special form.

Yesterday I told you that if is a function.

Today we're going to look at the if command.