Data Structures

Question 1

The two values that do not have properties

Answer 1

Null and undefined

Question 2

Two main ways to access object properties

Answer 2

Val.property (Dot notation)

Val[property] (Sq. br. notation)

Question 3

When accessing a value’s properties - dot notation accesses the […] name.

Answer 3

Literal

Question 4

When accessing a value’s properties - value[x] accesses the property that x […], converted to a string

Answer 4

Evaluates to

Question 5

Values of the type object are arbitrary collections of [..]

Answer 5

Properties

Question 6

Two uses of curly braces in JS

Answer 6

Start a block of statements

Describe an object

Question 7

Remove a named property from an object using this unary operator

Answer 7

Delete

Question 8

Binary operator that, when applied to a string and object, tells you if the object has the named property

Answer 8

in

Question 9

Object.keys() returns the [..] of the object

Answer 9

property names

Question 10

Object.assign() copies all [..] from one object to another

Answer 10

Properties

Question 11

Immutable objects in JS include [..], Boolean and numbers

Answer 11

Strings

Question 12

Immutable objects in JS include strings, Boolean and [..]

Answer 12

Numbers

Question 13

Object bindings have the same [..] if they point to the same object

Answer 13

Identity

Question 14

== operator compares by [..]

Answer 14

Identity

Question 15

If a property name in brace notation isn’t followed by a name, its value is taken from the [..] with the same name

Answer 15

Binding

Question 16

Strings, numbers and Boolean are not

Answer 16

Objects

Question 17

Method for arrays and strings which gives the index of a character (or substring)

Answer 17

indexOf()

Question 18

String method which returns a new string containing multiple copies of the original, glued together

Answer 18

repeat()

Question 19

A data structure that assigns values to other values

Answer 19

Map