Ways to specify an unused parameter within a function

As I work on my code, I encounter the need to separate the key and value from a request params object in order to validate the value using ObjectID. To achieve this, I decided to iterate over an array of entries and destructure the key and value for testing purposes. However, I am facing an error message:

'_key' is defined but never used

What steps should I take to resolve this issue?

export const validateObjectId = (request: Request, response: Response, next: NextFunction) => {
    Object.entries(request.params).map(([_key, param]) => {
        if (!ObjectId.isValid(param)) {
            return errorConstants.sendErrorResponse(response, errorConstants.invalid_object_id);
        }
    });
    next();
};

Answer №1

Instead of using Object.entries, why not simplify the code by utilizing Object.values when working with just values and not keys?

Furthermore, considering that the resulting array is not used, opting for .forEach over .map might be more appropriate in this scenario. Since the return value isn't needed either, omitting the return statement would suffice:

export const validateObjectId = (request: Request, response: Response, next: NextFunction) => {
    Object.values(request.params).forEach((param) => {
        if (!ObjectId.isValid(param)) {
            errorConstants.sendErrorResponse(response, errorConstants.invalid_object_id);
        }
    });
    next();
};

Answer №2

It seems like everything is correct based on my analysis. However, it appears that your code may be triggering a warning from the linter due to declaring _key without using it. This issue stems from the array-destructuring syntax conflicting with your linter settings. One alternative approach would be to avoid destructuring entirely:

Object.entries(request.params).map((pair) => {
  const param = pair[1];
  // continue with the rest of the code
});

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