wrong answers

Question 1

parse() static method for Date

Answer 1

takes a date string entered in the ISO 8601 extended format and converts the date to number of milliseconds

Question 2

now() static method for date

Answer 2

returns number of milliseconds since jan 1 1970

Question 3

event bubbling is the default type of event propagation that occurs when an event occurs

Answer 3

true (to stop, set to true)

Question 4

mock

Answer 4

in unit testing, a mock is needed to test code that is impractical to test under normal circumstances. a mock is usually an object that has the same data and behaviors of a real object that is returned from an actual server

Question 5

elements panel of the browser dev tools

Answer 5

you can use to inspect elements and modify their attributes

Question 6

strict mode

Answer 6

variables are required to be declared first before they can be used or assigned to a value. otherwise, an error will be thrown.

Question 7

scope vs. watch

Answer 7

scope: shows local and global vars and their values, including closure variables; here you can also edit the values directly by double-clicking on them
watch: checking variable values as well but does not give info about variable scope

Question 8

in newest version of node, how do you debug

Answer 8

node inspect index.js

Question 9

in order to define a privileged function…

Answer 9

a developer can make use of a closure

Question 10

onevent handlers

Answer 10

can be used to assign a single event to an HTML element; the onevent handler is assigned to the HTML element using dot syntax. the assignment operator is used to designate teh function that will be invoked when the next event occurs. the onevent handlers are all lowercase such as onclick

Question 11

the filter method

Answer 11

create a new array that passes the given condition

Question 12

the filter method

Answer 12

create a new array that passes the given condition

Question 13

when using a default export…

Answer 13

the function or variable can be assigned any name on import

Question 14

monitorEvents

Answer 14

can be used to display the event object for a particular event or category of events. the first parameter is the object for which events are monitored. the second parameter can be a category of events (like mouse or key), a specific event like click, or an array that contains specific events

Question 15

call, apply, bind

Answer 15

call and apply: indirectly invoke a function; these methods can be used to establish that they keyword ‘this’ references by passing an object as the first parameter
apply - receives arguments in an array
bind: returns a new function; the returned function has a value bound to the this keyword

Question 16

this property

Answer 16

cannot be accessed from within a nested function in a class method

Question 17

truths about the DOM

Answer 17

the document represents the whole web page
every object located in the DOM is called a Node

<h1> and <img></img> are examples of the element data type</h1>

Question 18

valid ways to retrieve the directory of a given file

Answer 18

path. parse(file).dir

path. dirname(file)

Question 19

decorators

Answer 19

multiple decorators are allowed to be used in classes and class properties. the decorators are evaluated top to bottom. then the results are called as a function from bottom to top.

Question 20

then statements

Answer 20

should return a value in order to implement promise chaining

Question 21

to prevent console from clearing when a page reloads

Answer 21

enable “Preserver Log” in the browser

Question 22

throw statement

Answer 22

allows a developer to create an exception and to define the exception message
the throw statement will stop the execution of the current function and then pass control to the catch block

Question 23

import as a function

Answer 23

returns a promise (so you can use chaining) / any exported values can be used from the module passed in as an argument

Question 24

decorators of classes

Answer 24

the prototype should be accessed via the first argument of the decorator function
the decorator function receives only one argument as it is being used as a class decorator

Question 25

Promise.race()

Answer 25

returns a promise as soon as one of the promises passed to it is fulfilled or rejected