What's the best way (most efficient) to turn all the keys of an object to lower case?

Question

I\'ve come up with

function keysToLowerCase (obj) {
  var keys = Object.keys(obj);
  var n = keys.length;
  while (n--) {
    var key = keys[n]; // \"cache\"         


        

Answer 1

Simplified Answer

For simple situations, you can use the following example to convert all keys to lower case:

Object.keys(example).forEach(key => {
  const value = example[key];
  delete example[key];
  example[key.toLowerCase()] = value;
});

You can convert all of the keys to upper case using toUpperCase() instead of toLowerCase():

Object.keys(example).forEach(key => {
  const value = example[key];
  delete example[key];
  example[key.toUpperCase()] = value;
});