Q71. What is the context package used for and how do you use it correctly?
`context.Context` carries deadlines, cancellation signals and request-scoped values across API boundaries and goroutines. It is how cancellation and timeouts propagate th...
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Job Interview Questions and Answers Directory
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Q72. Compare ahead-of-time and just-in-time compilation.
Ahead-of-time, AOT, compilation translates the program to machine code before it runs, producing a native binary. Startup is fast, memory overhead is predictable and ther...
Q73. What is attribution modelling and why is it hard?
Attribution assigns credit for a conversion to the marketing touchpoints along the customer journey. The model choice changes how budget is allocated. Common models: - La...
Q74. When should you prefer the aggregation framework over find?
Use find for simple filtering, projection, sorting and pagination on a single collection. It is lightweight and uses indexes efficiently. Use aggregate when you must tran...
Q75. What is GraphQL federation and when do you need it?
Federation lets several teams own separate GraphQL subgraphs and compose them into one graph for clients. Each subgraph declares the entities it owns with a key directive...
Q76. What causes hydration mismatches and how do you fix them?
Hydration is React attaching event handlers to server-rendered HTML. A mismatch happens when the server HTML differs from the client's first render, and React warns and r...
Q77. How does zone.js drive change detection and what changes with zoneless Angular?
Historically Angular relied on zone.js, which monkey-patches async APIs such as setTimeout, promises, XHR and event listeners so the framework knows when something might ...
Q78. How do you optimise the performance of a large Vue application?
Practical Vue 3 optimisations: use computed instead of methods in templates so results are cached, and split large components. Prefer shallowRef or shallowReactive for la...
Q79. How would you write a robust, idempotent automation script?
A production script should be safe to re-run, fail clearly and clean up after itself. ```bash #!/usr/bin/env bash set -euo pipefail workdir=$(mktemp -d) cleanup() { rm -r...
Q80. What is the Global VM Lock and how does it affect concurrency?
MRI, the standard Ruby implementation, has a Global VM Lock: only one thread executes Ruby bytecode at a time, so threads do not provide CPU parallelism for pure Ruby cod...