在JavaScript中简化1 /（Math.pow（2，y）？

Question

I have a case where I want to return

y = 1/2^x

basically

1
1/2
1/4
1/8
...

This is the best I've come up with

function halfing (depth){
    return 1/(Math.pow(2, (depth) ))
}

Is there a simpler and easier to follow way of doing this?

Answer 1

From a Wikibooks article on mathematics :

A negative exponent simply means you take the reciprocal (one over the number) of the base first, then apply the exponent.

So you can move the reciprocal into the Math.pow call:

function halfing(depth) { 
   Math.pow(2,-depth);
}