Tech QA

Tech QA

• HTML

  • HTML page parts: head, body, css, scripts

  • Semantics

  • Simple form: name, email, age, phone, submit #coding-task

  • What are data- attributes good for?

  • Describe the difference between <script>, <script async> and <script defer>

  • Re-flow / repaint

  • HTML5 - difference, new tags and APIs

• CSS

  • Cascade, Specificity, Selector weight

  • Document flow

  • Box model

  • Positioning

  • Z-index

  • "inherit" values

  • Flex?

  • Grid?

  • Units: %, px, em/rem (difference), vh/vw, vmin/vmax

  • Responsive/Adaptive design, @-media

  • Pre- and post-processing

• DOM / BOM

  • Tree structure, traversing, adding-removing nodes

  • Events: bubbling and capturing, delegation, Event obj

• CS

  • Overview, Paradigms (OOP, FP)

  • Typing: static-dynamic, strict-weak

  • Data structures: array, linked-list, queue, stack

• JS

  • Types, type coercion, truthy/falsy

  • Functions

  • Context, this, bind - apply - call, currying

  • Prototypes, inheritance

  • ES2015+ features: let/const, default params, rest/spread, Promise/async-await

  • Array methods

  • AJAX: XMLHttpRequest, Cross-Origin Resource Sharing, fetch

  • Event loop

  • memoization

  • throttling/debouncing, difference

  • Modules, AMD - CommonJS - ES2015+ difference

  • Typescript

  • Describe redux flow and main parts

• TS

• Angular

  • Describe overall exp w/ Angular

  • Capabilities, Pros & Cons

  • What is app main building element, components

  • Component vs Module - difference?

  • Services

  • What is scope?

  • Routing

  • pipes

  • RxJs

• Tasks:

  • f(birthDate) => age; Is it pure?

  • example of inheritance (Shape, Animal, Car)

  • replace digits in a string

  • revert order of symbols in a string

  • check if a string is palindrome

  • fn gets 'options' arg and overwrites default options

  • example of xhr request wrapped in promise or async

  • tree search

  • sum fn with any number of arguments

  • AlarmClock class, run subscriptions every n seconds

  • fn, enter number n, print multiplications of 1..n on 1..n

  • Cascade function

  • Query string from object

  • Linked List in js (with add, remove, insert)

• General dev themes

  • Progressive enhancment

  • Patterns: composition, factory, decorator, singleton, pub/sub

  • Unit tests

  • HTTP: Types of requests, response codes, headers, cookies, CORS

  • REST

  • Optimization: CDN, # of requests, load order, lazy load, cache, gzip, chunks

  • Code Quality: CR, comments, linters, naming and formatting, conventions and style guides

  • Dev process: Git, Agile

  • Do you know/look into some adjacent technologies

• Personal traits

  • How do you keep up with the trends? Blogs, books?

  • The most interesting thing in FE currently?

  • Failed deadline - who is to blame?

  • Are you ready to work on unpleasant tasks (like doing markup or manual testing)