LiveScript

LiveScript is a functional programming language that compiles to JavaScript. It was created by Jeremy Ashkenas—the creator of CoffeeScript—along with Satoshi Muramaki, George Zahariev, and many others.[2] Not to be confused with JavaScript (for a brief period in the 1990s, LiveScript was the name of JavaScript).[3]

For the primary web scripting language initially known as LiveScript, see JavaScript.
LiveScript
Paradigmmulti-paradigm, functional, object-oriented
Designed byJeremy Ashkenas, Satoshi Murakami, George Zahariev
DeveloperJeremy Ashkenas, Satoshi Murakami, George Zahariev
First appeared2011 (2011)
Stable release
LiveScript 1.6.0 / 24 August 2018 (2018-08-24)[1]
Typing disciplinedynamic, weak
OSCross-platform
LicenseMIT
Filename extensions.ls
Websitelivescript.net
Influenced by
JavaScript, Haskell, CoffeeScript, F#

Syntax

LiveScript is an indirect descendant of CoffeeScript.[4] The following hello world program is written in LiveScript, but is also compatible with Coffeescript:

hello = ->
  console.log 'hello, world!'

While calling a function can be done with empty parens, hello(), LiveScript treats the exclamation mark as a single-character shorthand for function calls with zero arguments: hello!

LiveScript introduces a number of other incompatible idioms:

Name mangling

At compile time, the LiveScript parser implicitly converts kebab case (dashed variables and function names) to camelcase.

hello-world = ->
  console.log 'Hello, World!'

With this definition, both the following calls are valid. However, calling using the same dashed syntax is recommended.

hello-world!
helloWorld!

This does not preclude developers from using camelcase explicitly or using snakecase. Dashed naming is however, common in idiomatic LiveScript[5]

Pipes

Like a number of other functional programming languages such as F# and Elixir, LiveScript supports the pipe operator, |> which passes the result of the expression on the left of the operator as an argument to the expression on the right of it. Note that in F# the argument passed is the last argument, while in Elixir it is the first.

"hello!" |> capitalize |> console.log
# > Hello!

Operators as functions

When parenthesized, operators such as not or + can be included in pipelines or called as if they were functions.

111 |> (+) 222
# > 333

(+) 1 2
# > 3

References
  1. "LiveScript Releases". Retrieved 6 October 2018.
  2. "LiveScript contributors page". Retrieved 20 June 2015.
  3. "W3 Web Education Community Group". Retrieved 20 June 2015.
  4. http://livescript.net/
  5. http://www.preludels.com/
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