folding-to-the-moon.js

function foldTo(distance) {
  
  // If we're given a bogus distance, return null
  if (distance < 0) {
    return null;
  }
  
  // Initial paper thickness and number of folds
  let paperThickness = 0.0001;
  let numFolds = 0;
  
  // Fold our paper until it is equal to or greater than the given distance
  while (paperThickness < distance) {  
    paperThickness = paperThickness * 2;
    numFolds = numFolds + 1;
  }
  
  // Output numFolds
  return numFolds;
}