PPAR Week 01

What is the output of the following code:

let test;

console.log(test);

• undefined

• null

• Error

• Nothing

Which keyword(s) apply to the const keyword?

• Block scope

• Global scope

• Function scope

• Immutable

• Mutable

What are valid ways to create a function in JavaScript?

• function a(){ console.log("a");

  }

• const b = _ => console.log("b");

• let c = function() { console.log("c");

  }

• let d => { console.log("d")

  }

Which of the following statements are true?

• 1 == "1"

• 1 === "1"

• 1 == 1

• 1 === 1

What are valid ways to create objects in JavaScript?

• const a = {

  name: "test"

  };

• function B(){

  this.name = "test";

  }

  const b = new B();

• class C{

  name = "test";

  }

  const c = new C();

• class D {

  public:

  name = "test";

  }

  const d = new D();

What are the correct ways of looping through an array in JavaScript?

• arr.forEach(e => console.log(e));

• for(const e of arr){

  console.log(e);

  }

• for(let i = 0;i < arr.length;i++){

  console.log(arr[i]);

  }

• for(const e in arr){

  console.log(e);

  }

What is the result of the following code snippet?

[..."👨‍👩‍👦‍👦"]

• ['👨', '‍', '👩', '‍', '👦', '‍', '👦']

• ["👨‍👩‍👦‍👦"]

• Error

• "👨‍👩‍👦‍👦"

Which questions are true regarding the DOM?

• Stands for Document Object Model

• Represents the HTML document

• JavaScript can interact with it

• Can add events using:

  element.event(...)

What are the ways to do asynchronous programming in JavaScript?

• Callbacks

• Promises

• Async/Await

• Futures

What is functional programming?

• Programming paradigm

• Based on mathematical functions

• Emphasize immutability

• Uses pure functions