Execjs

Execjs allows you easily run JavaScript from Elixir. It can automatically pick the best runtime available on the system.

Runtimes

Execjs supports the following runtimes:

• Node.js
• V8
• SpiderMonkey
• JavaScriptCore
• Rhino

Use the application environment (application key: :execjs, key: :runtime) to set the runtime Execjs uses. Alternatively, the EXECJS_RUNTIME environment variable can also be used to set the runtime.

Usage

eval

iex> "'red yellow blue'.split(' ')" |> Execjs.eval
["red", "yellow", "blue"]

compile/call

iex> {source, 0} = System.cmd("curl", ["-fsSL", "--compressed", "https://coffeescript.org/browser-compiler/coffeescript.js"])
iex> context = Execjs.compile(source)
iex> Execjs.call(context, "CoffeeScript.compile", ["square = (x) -> x * x"])
"(function() {\n var square;\n\n square = function(x) {\n return x * x;\n };\n\n}).call(this);\n"