random

Question 1

assign by value or reference?

var myAddress = { street: "123 JS Blvd", city: "Austin", state: "TX" };
var yourAddress = myAddress;
myAddress.street = "456 TS Ave";
console.log(yourAddress.street);

Answer 1

objects are assigned by reference.

// 456 TS Ave

Question 2

assign by value or reference?

var myName = "Kyle";
var yourName = myName;
myName = "Frank";

console. log(myName);
console. log(yourName);

Answer 2

primitives are always copied as value

// Frank
// Kyle

Question 3

whats the difference between call and apply

Answer 3

theFunction.apply(valueForThis, arrayOfArgs)

theFunction.call(valueForThis, arg1, arg2, …)

apply is useful for passing arguments through wrapper functions

Question 4

what does it mean for a property to shadow

Answer 4

when an object’s prototype has a property defined, and also defines that property, cutting off prototype lookup.

Question 5

difference between target and currentTarget

Answer 5

target initiated the event

currentTarget has the event handler

Question 6

what does screen x/y measure

Answer 6

this measurement is relative to the computers screen, not just the browser window

Question 7

what does offset x/y measure

Answer 7

this measures the distance from the edge of the element to the click location

Question 8

what does client x/y measure

Answer 8

this is measurement from the edge of the window to the click location, even if content is scrolled

Question 9

what does pagex measure

Answer 9

this is the distance from the edge of the page, even if the top is scrolled out of the window