[removed] Object Rename Key

Question

Is there a clever (i.e. optimized) way to rename a key in a javascript object?

A non-optimized way would be:

o[ new_key ] = o[ old_key ];
delete o[ o         


        

Answer 1

Most of the answers here fail to maintain JS Object key-value pairs order. If you have a form of object key-value pairs on the screen that you want to modify, for example, it is important to preserve the order of object entries.

The ES6 way of looping through the JS object and replacing key-value pair with the new pair with a modified key name would be something like:

let newWordsObject = {};

Object.keys(oldObject).forEach(key => {
  if (key === oldKey) {
    let newPair = { [newKey]: oldObject[oldKey] };
    newWordsObject = { ...newWordsObject, ...newPair }
  } else {
    newWordsObject = { ...newWordsObject, [key]: oldObject[key] }
  }
});

The solution preserves the order of entries by adding the new entry in the place of the old one.