Deno vs. Node.js Performance and Benchmarks Quiz Quiz

Explore how runtime architecture and design choices impact performance in Deno and Node.js environments. This quiz evaluates your understanding of key factors, benchmark meanings, and performance differences between these two popular JavaScript runtimes.

1. JavaScript Engine Use

   Which JavaScript engine do both Deno and Node.js primarily use for executing JavaScript code?

   1. WebKit
   2. V8
   3. Java
   4. SpiderMonkey

   Explanation: V8 is the JavaScript engine used by both platforms for code execution, making it crucial for performance comparisons. SpiderMonkey is used in other environments and is not the main engine here. Java is not a JavaScript engine, and WebKit refers to a browser rendering engine, not a JavaScript runtime core.

2. Concurrency Handling

   What mechanism do both Deno and Node.js use to handle multiple tasks concurrently in applications?

   1. GPU Threads
   2. Multithreading
   3. Event Loop
   4. Batch Processing

   Explanation: Both rely on an event loop to handle multiple tasks without blocking, which is efficient for I/O operations. Multithreading isn't the default for most JavaScript runtimes. Batch processing is unrelated to asynchronous event handling. GPU threads are used for graphical computing, not general JavaScript concurrency.

3. Out-of-the-Box Performance

   Which runtime aims to offer more secure and efficient out-of-the-box performance with strict permissions enabled by default?

   1. Node.js
   2. JSX
   3. Deno
   4. Python

   Explanation: Deno was designed with secure and efficient defaults, including permission checks, which may affect performance tests. Node.js does not enable such permissions by default. JSX is not a runtime, and Python refers to an unrelated programming language.

4. Startup Time

   When comparing startup time for running a simple script, which runtime is generally reported to have a slower initial startup?

   1. Deno
   2. Node.js
   3. Ruby
   4. C++

   Explanation: Deno tends to have a slower startup than Node.js due to its built-in security and TypeScript support. Node.js typically starts scripts faster. Ruby and C++ are not JavaScript runtimes and are incorrect in this context.

5. HTTP Server Benchmark

   In basic HTTP server benchmarks, which environment often shows higher raw requests-per-second performance?

   1. Deno
   2. Go
   3. HTML
   4. Node.js

   Explanation: Node.js usually outperforms Deno in raw HTTP server benchmarks due to its mature and optimized networking libraries. Deno is catching up but often lags behind for now. HTML is a markup language, not a runtime, and Go is a separate programming language not part of the comparison.

6. TypeScript Support Impact

   How can built-in TypeScript support in a runtime affect the code execution performance compared to one that only supports JavaScript?

   1. It can slow initial execution due to runtime compilation
   2. It always speeds up execution
   3. It disables JavaScript support
   4. It guarantees higher security

   Explanation: Processing and compiling TypeScript on the fly can cause slower startup times before execution. It does not always make execution faster and doesn't guarantee security. TypeScript support does not disable JavaScript.

7. Memory Usage

   When running similar applications, which runtime commonly consumes more memory due to additional built-in features?

   1. Node.js
   2. SQL
   3. C#
   4. Deno

   Explanation: Deno often uses more memory because of built-in features like permissions and TypeScript support. Node.js is typically more streamlined for memory usage. SQL and C# are unrelated tools and not applicable to this runtime comparison.

8. Native Module Handling

   Which runtime currently has wider support for native modules and external C++ bindings, potentially affecting performance in compute-heavy tasks?

   1. SwiftJS
   2. Deno
   3. JavaScriptXML
   4. Node.js

   Explanation: Node.js has a large ecosystem and established support for native add-ons, aiding performance for specialized tasks. Deno's support is newer and less mature. JavaScriptXML and SwiftJS are not real runtimes or established technologies.

9. Benchmark Factors

   What factor can significantly skew performance benchmarks between Deno and Node.js, making results misleading?

   1. Differences in permission and security settings
   2. Synchronized clocks
   3. Identical code structure
   4. Equal memory allocation

   Explanation: Default security and permissions can affect speed, as additional checks in some environments can slow tasks. Identical code and equal memory make benchmarks more fair, not skewed. Synchronized clocks are unrelated to code performance itself.

10. I/O Performance

    In performance benchmarks involving file reading, which platform often demonstrates less overhead due to minimal permission checks?

    1. RustyJS
    2. Deno
    3. Pearl
    4. Node.js

    Explanation: Node.js typically has less overhead in basic file operations because it lacks strict permission checks by default, whereas Deno prioritizes security at a small performance cost. Deno performs additional checks, reducing its raw speed. RustyJS and Pearl are fictional or unrelated in this context.