documentation/sections/splats.md
The JavaScript arguments object is a useful way to work with functions that accept variable numbers of arguments. CoffeeScript provides splats ..., both for function definition as well as invocation, making variable numbers of arguments a little bit more palatable. ES2015 adopted this feature as their rest parameters.
codeFor('splats', true)
Splats also let us elide array elements...
codeFor('array_spread', 'all')
...and object properties.
codeFor('object_spread', 'JSON.stringify(currentUser)')
In ECMAScript this is called spread syntax, and has been supported for arrays since ES2015 and objects since ES2018.