How Can I Optimize Key Renaming in JavaScript Objects?

Optimizing Key Renaming in JavaScript Objects

Renaming keys within a JavaScript object is a common task. While there are various approaches, optimizing this operation can enhance performance.

Non-Optimized Approach:

A straightforward approach involves assigning the value of the old key to a new key and then deleting the old key:

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

Optimized Approach:

A more optimized approach combines property descriptor copying and deletion:

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

This ensures that the renamed property inherits the same attributes and behavior as the original property, preserving its inherited and non-inherited properties.

Furthermore, wrapping this into a function or adding it to Object.prototype is beyond the scope of the original question, which focuses specifically on optimizing key renaming.

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