Q111. What is the difference between val and var?
`val` declares a read-only reference that cannot be reassigned after initialisation. `var` declares a mutable reference that can be reassigned. ```kotlin val name = "Ada"...
Technical Question Bank · Peer-Reviewed
Job Interview Questions and Answers Directory
Search and filter frequently asked interview questions across technical, programming, and behavioral domains. Tailor your interview preparation by difficulty for freshers or experienced developers (2,728 available).
Q112. When should you use StringBuilder instead of string concatenation?
`string` is immutable: every operation such as concatenation or `Replace` allocates a new string. `StringBuilder` is a mutable buffer backed by a resizable array, so appe...
Q113. How do stack and heap allocation differ in C++?
The stack is a LIFO region managed automatically: allocation is a pointer bump, extremely fast, and memory is reclaimed when the scope ends. The heap is a large pool mana...
Q114. What is the difference between String and &str in Rust?
`String` is an owned, growable, heap-allocated UTF-8 string (essentially a `Vec`) that you can mutate and extend. `&str` is a borrowed string slice: a pointer plus a leng...
Q115. What is the difference between new and make in Go?
`new(T)` allocates zeroed memory for a value of type T and returns a pointer `*T`. It works for any type and is rarely used. `make` only works for slices, maps and channe...
Q116. In how many ways can the letters of the word "LEVEL" be arranged?
The word LEVEL has 5 letters with repeats: L appears 2 times, E appears 2 times, V appears once. Total arrangements = 5! / (2! x 2!) = 120 / 4 = 30. Approach: start with ...
Q117. Tell me about a time you led a project or team.
Pick a project where your leadership is measurable. Situation and Task: "Our checkout conversion dropped 12% after a redesign, and no one owned the fix." Action: "I volun...
Q118. What is your greatest weakness?
Choose a genuine, non-fatal weakness and show the mitigation and progress. Formula: name it, give a concrete example, explain what you changed, and quantify improvement. ...
Q119. How do you design a CI/CD pipeline?
Stages: 1. Trigger on push or pull request. 2. Build: compile, install dependencies, produce an immutable artefact (container image) tagged with the commit SHA. 3. Static...
Q120. What is the CAP theorem and how does it guide decisions?
A distributed store can guarantee only two of three during a network partition: Consistency (every read sees the latest write), Availability (every request gets a non-err...