Q151. What is linear regression and what are its assumptions?
Linear regression models a continuous target as a linear combination of predictors plus error: y = b0 + b1*x1 + ... + e. Coefficients are estimated by ordinary least squa...
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Q152. Explain how gradient descent optimizes a model.
Gradient descent minimizes a loss function by repeatedly moving parameters in the direction that decreases the loss. The gradient is the vector of partial derivatives, an...
Q153. How do you schedule recurring tasks with cron and what are common pitfalls?
cron runs commands on a schedule defined by five time fields: minute, hour, day of month, month and day of week. ```bash # m h dom mon dow command 30 2 * * * /usr/local/b...
Q154. How do you design a multi-region failover architecture on AWS?
Design around an RTO and RPO first; they determine active-active versus active-passive. - DNS and traffic: Route 53 health checks with failover or latency routing, plus G...
Q155. How do cache eviction policies differ?
Eviction decides what to remove when the cache is full or memory is constrained: - LRU (least recently used): evicts the item not accessed for the longest time. A solid d...
Q156. How do you handle authorization in a GraphQL API?
Authorization belongs in the server layer, never in the client query. Because clients can request any combination of fields, enforce rules at the field and object level, ...
Q157. How do you optimise Tailwind for production?
Tailwind's performance story is about generation and delivery. The JIT engine produces only the utilities present in scanned files, so production CSS is typically a few k...
Q158. What are the pitfalls of command substitution?
Command substitution captures the stdout of a command as a string. Use `$(cmd)` rather than backticks, which are deprecated and harder to nest. ```bash today=$(date +%F) ...
Q159. Compare the scope functions let, run, with, apply and also.
All five run a block with an object in context. They differ in how the object is referenced (`it` or `this`) and what they return (the object or the lambda result). - `le...
Q160. How does defer work in Go and what are the common pitfalls?
`defer` schedules a function call to run when the surrounding function returns. Deferred calls run in LIFO order and are typically used for cleanup such as closing files ...