Javascript / computer science pub quiz

These are the slides for a javascript / computer science pub quiz that happened for the reactivate London meetup.

Transcript

1. Please form teams of up to 6 contestants The Reactivate (Pub) Quiz
2. Warm up time! Category 1
3. Inside which HTML element can we put JavaScript code? A. <scripting> B. <script> C. <javascript> D. <js> 1.
4. Which of the following is not a pattern to handle asynchronous operations? A. Callbacks B. Closure C. Promises D. Generator 2.
5. Which of the following are NOT JavaScript data structures in ES.next? • Map • Set • List • Record 3. • Array • Tree • Object • Dictionary
6. Which of the following do NOT execute a function? 4. fn.bind(this, ...args) fn.call(this, ...args) fn.apply(this, ...args) fn() A. B. C. D.
7. What is the process called by which unused ES Modules are automatically removed from a bundle? 5.
8. Which project gained more than 25K stars on GitHub in 2016? A. React B. Vue C. Angular 2 D. Yarn 6.
9. Sort these packages by number of downloads for the last month. 7. • React • Express • Request • Underscore • Backbone
10. What is the data structure of the Virtual DOM? A. Tree B. Hashmap C. Stack D. Heap 8.
11. What is the transport layer used for an HTTP request? A. UDP B. SCTP C. DCCP D. TCP 9.
12. Which of the following are NOT module bundlers? • Webpack • Rollup • Yarn • Browserify • Require.js 10.
13. What is the name of the new code formatting tool for JavaScript? 11.
14. Quirks & JS Knowledge YOU are the engine! Category 2
15. What does the following evaluate to in JavaScript? 1. 0.1 + 0.2
16. What does the following evaluate to in JavaScript? 2. ~"4"
17. What sentence would the following HTML&CSS code spell out? 3. <div class="main"> <div>my</div> <div>name</div> <div>is</div> <div>confusing</div> </div> .main { display: flex; flex-direction: row-reverse; } .main div:nth-child(2) { order: -1; } .main div:nth-child(1):before { content: "not"; }
18. What do the following expressions evaluate to? 4. typeof NaN typeof null typeof Object typeof [] A. B. C. D. E. typeof +"3"
19. Which of the following typically don’t compile or transpile to JavaScript? 5. • Purescript • Elm • Turboscript • Reason • TypeScript • AssemblyScript
20. What does the following code print to stdout? 6. (function fn() { console.log(arguments.map); })();
21. Which of the following expressions are truthy? 7. null "0" [].length undefined A. B. C. D. E. "hello world" F. {}
22. What does the following evaluate to in JavaScript? 8. const a = [1, 2, 3]; const b = a; const c = b.slice(); a === b && a === c
23. What does the following code evaluate to in Node 8? 9. const fn = (x = 2) => x; fn() + fn(1)
24. Which of the following Array methods don’t mutate the original array? 10. • concat • splice • slice • pop • push • shift • unshift
25. What does the following code evaluate to? 11. (function() { function f() { return 1; } return f(); function f() { return 2; } })();
26. History & Browser Facts Category 3
27. What are the names of the two cores in V8’s compilation pipeline? 1.
28. In what year were the following created? A. JavaScript B. React C. Node 2.
29. Link each JavaScript engine to the browsers that are using them 3. A. Chakra B. JavaScriptCore C. V8 D. SpiderMonkey 1. Edge 2. Safari 3. Chrome 4. Chromium 5. Opera 6. Firefox
30. Link each web browser engine to the browsers that are using them 4. A. Webkit B. Blink C. Gecko D. EdgeHTML 1. Edge 2. Safari 3. Chrome 4. Chromium 5. Opera 6. Firefox
31. Which of the following browsers has its engine written in Rust? A. Chrome B. Opera Neon C. Servo D. Edge 5.
32. Who is the creator of JavaScript? 6.
33. Computer Science & Functional Programming Category 4
34. Which of the following is not a functional programming language? A. F# B. Erlang C. Lisp D. Java 1.
35. What is the time complexity for finding a value in a binary tree? A. O(log n) B. O(n) C. O(n2) D. O(1) 2.
36. Which of the following could one use to find the quickest path in a graph? A. Quick Sort B. Fourier Transformation C. Secure Hash D. Dijkstra 3.
37. What is the output of the following code? A. 6 B. 8 C. 10 D. TypeError 4. const compose = (...fns) => input => fns .reverse() .reduce((prev, fn) => fn(prev), input) compose(x => x + 2, x => x + 4)(4)
38. What functional pattern is being applied in the following snippet? A. Composition B. Monoids C. Recursion D. Currying 5. const addBase = base => num => base + num;
39. Which of the following is a valid Haskell function type definition? 6. length:: [a] -> Int length: (arr: number[]) => number public int length(int[] values) {} A. B. C.
40. Which of the following languages has a lisp-like syntax? A. Java B. C++ C. Clojure D. Haskell E. Rust 7.
41. Tooling & Standards Category 5
42. What was the version before React 15.0.0? 1.
43. Which tool is used to manage Babel’s monorepo? 2.
44. What is the name of the last European React conference? 3.
45. What are two popular alternatives to React, sharing a similar API? 4.
46. Which of the following are NOT dependencies of create-react- app? 5. • Autoprefixer • Gulp • dotenv • Enzyme • babel-core • Redux • left-pad • chalk
47. Which popular design app can you render React Primitives to? 6.
48. What is the actual name of the standard often referred to as “CSS Variables”? 7.
49. When <B/> replaces <A/> which method is called first in React 16? • componentWillUnmount of <A/> • componentWillMount of <B/> 8.
50. What would one typically use WebWorkers for? A. Execute code in a segregated environment / thread B. Access and modify the DOM asynchronously C. Support offline (-first) experiences 9.
51. Which ES proposal connected to higher-order-components was withdrawn and rewritten? 10.
52. Extra Credits! Category 6
53. Name four Reactivate speakers 1. (Points will only be awarded for four correct answers)
54. Name three places where Reactivate has been held previously 2. (Points will only be awarded for all three)
55. What is the new character limit on Twitter for a privileged few? 3.
56. Evaluation