Javascript tips: 2 to the power of x multiplied by n I'm new to ES6 and code-golfing. Here's the original function:



function puzzle(n, x) {
  return n * Math.pow(2, x);
}




And here's what I have so far:

let puzzle=(n,x)=&gt;n*2&lt;&lt;(x-1)


But the solution requires lesser characters. I went through the 'Code Golfing with ES6' thread, but couldn't find a better way.
Any help/links would be appreciated.
17 bytes:

puzzle=n=&gt;x=&gt;n&lt;&lt;x


This uses the fact that 2 * 2^n = 2^(n + 1). Also, by our rules, using currying instead of taking multiple arguments the usual way is allowed. Also, I don't think the let is needed.