Flipturn Technical

Question 1

Steps to read json from file?

Answer 1

• add file.json to directory
• create Codable struct for said data
• read data
• decode data

Question 2

How do you read a local json file?

Answer 2

let url = Bundle.main.url(forResource: “name”, withExtension: “json”)

Question 3

How do you get the data from a url?

Answer 3

let data = Data(contentsOf: url)

Question 4

How would you create Codable structs for this json?

{
“company”: {
“name”: “ABC Corp”,
“location”: “New York”
}
}

Answer 4

Create a “Model” type at the top level. and the model type has a “company” property, and the company type has a “name” property

Question 5

What is the line to decode some json?

Answer 5

let model = decoder.decode(Model.self, from: data)

Question 6

List 2 ways to decode snake case json

Answer 6

use coding keys or tell the decoder to expect snake case

Question 7

How do you decode snake case with coding keys?

Answer 7

the codable struct needs an enum that conforms to CodingKey

Question 8

Decode this json:

{
“company”: {
“legal_name”: “ABC Corp”,
“location”: “New York”
}
}

Answer 8

Create a “Model” type, then create a “Company” type. And Company should have an enum that conforms to “CodingKey”

Question 9

Steps to read json from string

Answer 9

same as from file except the Data initializer uses string.utf8, ie:

let data = Data(string.utf8)