Q91. What is a dead-letter queue and when should you use one?
A dead-letter queue (DLQ) is a separate queue that receives messages a consumer cannot process after exhausting retries. It prevents one poison message from blocking a pa...
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Q92. What is service discovery and why is it needed?
In a dynamic environment, service instances start, stop and move, so callers cannot rely on fixed hostnames. Service discovery maintains a registry of healthy instances a...
Q93. What is a GraphQL schema and what is SDL?
The schema is the contract between client and server: it declares the types, fields, arguments, return types and nullability that all operations are validated against. Th...
Q94. What does HATEOAS mean in REST?
HATEOAS stands for Hypermedia as the Engine of Application State. A response not only carries data but also links describing the actions and related resources the client ...
Q95. What does Babel do and how does it relate to bundlers?
Babel is a JavaScript compiler that transforms modern syntax into code older environments can run. It parses source into an AST, applies plugins that each handle a transf...
Q96. When should you use v-if instead of v-show?
v-if conditionally renders: when the expression is falsy the element and its children are not created, and they are destroyed when it flips. It supports v-else and v-else...
Q97. What is a property and how does it differ from a field?
A field is a variable declared directly in a class. A property is a member with `get` and `set` accessors that looks like a field to callers but runs code, enabling valid...
Q98. What do constructors and destructors do?
A constructor runs when an object is created and initialises its members. A destructor runs when it is destroyed and releases resources. Constructors share the class name...
Q99. What does Cargo do for a Rust project?
Cargo is Rust's build system and package manager. It handles dependency resolution, compilation, testing, documentation, benchmarking and publishing, which keeps projects...
Q100. What are zero values in Go and why do they matter?
Go has no uninitialised variables. Every type has a defined zero value: 0 for numeric types, false for bool, the empty string for string, nil for pointers, slices, maps, ...