Just a simple hack I came up with to facilitate really short pattern-matching. It is effectively a chain of if-elseif statements. The first time a condition is true, the associated expression or code block is evaluated, and nothing further.

chain.js

var x = false,
    y = true;
 
 
// Call functions in the evaluation
(x && y)?  alert("x and y matched")
    : x?   alert("x matched")
    : y?   alert("y matched")
    :      alert("default")
 
 
// Just do an assignment
var output =
(x && y)? "x and y"
    : x? "x"
    : y? "y"
    : "none"