Javascript function returns undefined when the value is clearly set

Javascript function returns undefined when the value is clearly set

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Common Pitfall: JSON Reviver Function Returning Undefined When Modifying Values
Common Pitfall: JSON Reviver Function Returning Undefined When Modifying Values
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Common Pitfall: JSON Reviver Function Returning Undefined When Modifying Values

Common Pitfall: JSON Reviver Function Returning Undefined When Modifying Values
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