[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

Some of the solutions listed on this page have some side-effects:

1. affect the position of the key in the object, adding it to the bottom (if this matters to you)
2. would not work in IE9+ (again, if this matters to you)

Here is a solution which keeps the position of the key in the same place and is compatible in IE9+, but has to create a new object and may not be the fastest solution:

function renameObjectKey(oldObj, oldName, newName) {
    const newObj = {};

    Object.keys(oldObj).forEach(key => {
        const value = oldObj[key];

        if (key === oldName) {
            newObj[newName] = value;
        } else {
            newObj[key] = value;
        }
    });

    return newObj;
}

Please note: IE9 may not support forEach in strict mode