How Can I Efficiently Rename Keys in a JavaScript Object?

Efficient JavaScript Object Key Renaming

Renaming keys in a JavaScript object can be done using the following non-optimized method:

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

However, a more optimal approach involves preserving the original property behavior:

if (old_key !== new_key) {
    Object.defineProperty(o, new_key,
        Object.getOwnPropertyDescriptor(o, old_key));
    delete o[old_key];
}

This method ensures that the renamed property behaves identically to the original one. It inherits all attributes such as accessibility and mutability.

While wrapping this into a function/method and adding it to the Object.prototype is possible, it is not directly relevant to the question of optimal key renaming.

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