js-quiz.js

// 1. Try to name all eight Javascript types

// 2. Which of these statements are true
0 == "0";
0 === "0";
null == undefined;
false == "false";
[] == "";
"" == false;
NaN == NaN;
({ a: 1 } == { a: 1 });
({} === {});
0.1 + 0.2 == 0.3;
0.2 + 0.2 == 0.4;
typeof [] == "array";
typeof {} == "object";
typeof console.log == "function";
typeof typeof 0 == "number";

// 3. Fill in the blank
["a", "b", "c", "d", "e", "f"].slice(/*???*/); // [c', 'd', 'e']
[1, 2, 3].map(/*???*/); // [2, 4, 6]
["Apfel", "Birne", "Aprikose", "Karotte", "Ananas"].filter(/*???*/); // ['Apfel', 'Aprikose', 'Ananans']
["A", "B", "B", "A"].reduce(/***/); // 'A-B-B-A'
["a", "b", "c", "d", "e"].sort(/***/); // ['e', 'd', 'c', 'b', 'a']

// 4. Name an example of a constructor function that's built into Javascript

// 5. What's the difference between an arrow function and a traditional function expression?

// 6. What's the difference between these two functions A and B?

async function A() {
  return "Hello";
}

function B() {
  return new Promise((resolve) => resolve("Hello"));
}

// 7. Which of these attributes/features are a part of Javascript (in its current widely used implementations)

/*
- Statically Typed
- Single Threaded
- Purely Functional
- Event-Based Concurrency
- Just in Time Compiled
- Ahead of Time Compiled
- Parallelisable
- Non Blocking I/O
- Imperative
- Object-oriented
- Multiple-inheritance
- Dynamic Scoping
- Lexical Scoping
- First Class Modules
- Garbage Collected
- Memory Safe
- Thread Safe
- Implicit Type Coercion
- Operator Overloading
- Dynamic
- Functional
*/

// 8. Use the fetch API to download a random joke from https://official-joke-api.appspot.com/random_joke
// Hint: paste the snippet into the console of your browser instead of node

// 9. How could you import all four functions

// math.js
const add = (a, b) => a + b

export { add };
export function mul(a, b) { return a * b; }
export const sub = (a, b) => a - b;
export default function div(a, b) { return a / b; }

// index.js
// import ??? from './math'