LiveScript

LiveScript is a functional language that compiles to JavaScript. It was created by Jeremy Ashkenas—the creator of CoffeeScript—along with Satoshi Muramaki, George Zahariev, and many others. Notably, LiveScript was briefly the name of JavaScript in 1990s.

LiveScript is an indirect descendant of and is partly compatible with Coffeescript. The following is a fully Coffeescript-compatible hello-world example of LiveScript syntax.

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:

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

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

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

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 the first argument to the expression on the right of it.

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