What is error first callback function?

Question

Accepted Answer

Error first callback function is a convention in Node.js where the first parameter of a callback function is reserved for an error object.

The error object is passed as the first argument to the callback function
If there is no error, the error object will be null or undefined
If there is an error, the error object will contain information about the error
This convention allows for consistent error handling in asynchronous operations
Example: fs.readFile(path, 'utf8', function(err, data) { ... })

Accepted Answer

error-first callback function is a callback function that takes two parameters as arguments: the first parameter is an error object, and the second parameter is the result or data returned by the function. The error object is passed as the first argument, and it is used to inform the calling function if any error occurred while executing the callback function.

What is error first callback function?

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