JSON

Question 1

What is JSON?

Answer 1

text-based data format following JavaScript object literal syntax

Question 2

What are serialization and deserialization?

Answer 2

serialization: process of turning an object in memory into a stream of bytes
deserialization: turning a stream of bytes into an object in memory

Question 3

Why are serialization and deserialization useful?

Answer 3

so you can do stuff like store it on disk or send it over the network

Question 4

How do you serialize a data structure into a JSON string using JavaScript?

Answer 4

JSON.stringify( )

Question 5

How do you deserialize a JSON string into a data structure using JavaScript?

Answer 5

JSON.parse( )

Question 6

How to you store data in localStorage?

Answer 6

storage = window.localStorage

storage.setItem(‘key’, ‘value’ )

Question 7

How to you retrieve data from localStorage?

Answer 7

.getItem( )

Question 8

What data type can localStorage save in the browser?

Answer 8

strings

Question 9

When does the ‘beforeunload’ event fire on the window object?

Answer 9

before the user tries to unload the page