Object

Question 1

Object.create()

Answer 1

Create an object with specified prototype and properties.

Question 2

Object.defineProperties()

Answer 2

Create or configure multiple properties on a given object.

Question 3

Object.defineProperty()

Answer 3

Create or configure a single property on a given object.

Question 4

Object.freeze()

Answer 4

Make an object immuntable.

Question 5

Object.getOwnPropertyDescriptor()

Answer 5

Query property attributes

Question 6

Object.getOwnPropertyNames()

Answer 6

Return the names of non-inherited properties.

Question 7

Object.getPrototypeOf()

Answer 7

Return the prototype of an object.

Question 8

Object.hasOwnProperty()

Answer 8

Check whether a property is inherited.

Question 9

Object.isExtensible()

Answer 9

Check whether new properties can be added to an object.

Question 10

Object.isFrozen()

Answer 10

Check whether an object is immutable.

Question 11

Object.isPrototypeOf()

Answer 11

Check whether one object is the prototype of another.

Question 12

Object.isSealed()

Answer 12

Check whether properties can be added to or deleted from an object.

Question 13

Object.keys()

Answer 13

Return an object’s enumerable property names.

Question 14

Object.preventExtensions()

Answer 14

Don’t allow new properties on an object.

Question 15

Object.propertyisEnumerable()

Answer 15

Check whether an object’s property will be seen by a for/in loop.

Question 16

Object.seal()

Answer 16

Prevent the addition or deletion of properties.

Question 17

Object.toLocaleString()

Answer 17

Return an object’s localized string representation.

Question 18

Object.toString()

Answer 18

Define an object’s string representation.

Question 19

Object.valueOf()

Answer 19

The primitive value of the specified object.

Question 20

Create an object with specified prototype and properties.

Answer 20

Object.create()

Question 21

Create or configure multiple properties on a given object.

Answer 21

Object.defineProperties()

Question 22

Create or configure a single property on a given object.

Answer 22

Object.defineProperty()

Question 23

Make an object immuntable.

Answer 23

Object.freeze()

Question 24

Query property attributes

Answer 24

Object.getOwnPropertyDescriptor()

Question 25

Return the names of non-inherited properties.

Answer 25

Object.getOwnPropertyNames()

Question 26

Return the prototype of an object.

Answer 26

Object.getPrototypeOf()

Question 27

Check whether a property is inherited.

Answer 27

Object.hasOwnProperty()

Question 28

Check whether new properties can be added to an object.

Answer 28

Object.isExtensible()

Question 29

Check whether an object is immutable.

Answer 29

Object.isFrozen()

Question 30

Check whether one object is the prototype of another.

Answer 30

Object.isPrototypeOf()

Question 31

Check whether properties can be added to or deleted from an object.

Answer 31

Object.isSealed()

Question 32

Return an object's enumerable property names.

Answer 32

Object.keys()

Question 33

Don't allow new properties on an object.

Answer 33

Object.preventExtensions()

Question 34

Check whether an object's property will be seen by a for/in loop.

Answer 34

Object.propertyisEnumerable()

Question 35

Prevent the addition or deletion of properties.

Answer 35

Object.seal()

Question 36

Return an object's localized string representation.

Answer 36

Object.toLocaleString()

Question 37

Define an object's string representation.

Answer 37

Object.toString()

Question 38

The primitive value of the specified object.

Answer 38

Object.valueOf()