Lecture 11 (ajax, string functions, classes)

Question 1

promise

Answer 1

ex. fetch returns a promise
object representing the eventual completion or failure of an asynchronous operation
promise = new Promise(function(resolve, reject) {})

Question 2

what do we use to work with promises?

Answer 2

then and catch

Question 3

ajax

Answer 3

asynchronous javascript and xml

Question 4

asynchronous

Answer 4

happens in the background and the user can perform other actions on the page

Question 5

are strings immutable

Answer 5

yes, and iterable

Question 6

trim

Answer 6

removes white trailing and ending whitespace

Question 7

toUpperCase, toLowerCase

Answer 7

self

Question 8

substring

Answer 8

takes two indexes and return first argument and second argument - 1

Question 9

split

Answer 9

takes an argument and splits the original string where that argument appears

Question 10

includes

Answer 10

check if the string includes the argument

Question 11

indexOf

Answer 11

returns the index of the argument

Question 12

setInterval

Answer 12

calls a function at specified intervals

Question 13

clearInterval

Answer 13

clears the interval

Question 14

setTimeout

Answer 14

call a function after a specified duration

Question 15

Date

Answer 15

object is used to work with dates and times
let d = new Date()
console.log(d.getFullYear()); // 2020

Question 16

typeof

Answer 16

returns a string indicating the type of the unevaluated operand

Question 17

class

Answer 17

a class as data and the associated methods which act on it
- think of a class as template for creating objects/instances

Question 18

constructor

Answer 18

used for initialization of data/variables