Swift convert an array to array of tuples

I have an array like this:

[Shivam, Shiv, Shantanu, Mayank, Neeraj]


I want to create an array of tuples(key , value) from this array only with key being first character and value being an array of strings:

tuples(key , value)

key

first character

value

array of strings

Like this:

[

(**key**: S , **value**: [Shivam, Shiv, Shantanu]),

(**key**: M , **value**: [Mayank]),

(**key**: N , **value**: [Neeraj])

]


PS: It is not a duplicate to this post Swift array to array of tuples. There OP wants to merge two arrays to create an array of tuples

1 Answer
1

Step 1: Create a grouped dictionary

let array = ["Shivam", "Shiv", "Shantanu", "Mayank", "Neeraj"]
let dictionary = Dictionary(grouping: array, by: String($0.prefix(1)))


Step 2: Actually there is no step 2 because you are discouraged from using tuples for persistent data storage, but if you really want a tuple array

let tupleArray = dictionary.map ($0.0, $0.1)


A better data model than a tuple is a custom struct for example

struct Section
let prefix : String
let items : [String]



then map the dictionary to the struct and sort the array by prefix

prefix

let sections = dictionary.map Section(prefix: $0.0, items: $0.1) .sorted$0.prefix < $1.prefix
print(sections)


let sections = dictionary.map(Section.init)

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