Q1. What are Type I and Type II errors?
A Type I error is a false positive: rejecting the null hypothesis when it is actually true. Its probability is the significance level alpha, usually 0.05. In a fraud syst...
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Q2. How do you handle errors in asynchronous Node.js code?
For promises and async functions use try/catch and let errors propagate to a central handler: ```js app.get('/users/:id', asyncHandler(async (req, res) => { const user = ...
Q3. How does PHP handle errors and exceptions?
Modern PHP uses exceptions. Throwable is the root interface with two branches: Error (engine-level, e.g. TypeError, DivisionByZeroError) and Exception (application-level)...
Q4. How does error handling work in GraphQL?
GraphQL usually returns HTTP 200 with a JSON body containing `data` and/or `errors`, because a single operation can partially succeed across fields. ```json { "data": { "...