Swift convert an array to array of tuples

Question

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:

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

vadian · Accepted Answer · 2018-09-15 16:21:01Z

5

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

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

edited Sep 15, 2018 at 16:21

answered Sep 15, 2018 at 15:29

vadian

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4 Comments

Shivam Pokhriyal Over a year ago

Actually I first used Dictionary only, but later on i had to sort the dictionary based on the key that is characters but couldn't do it. Tried everything to sort dictionary but couldn't so i moved on to array of tuples. I will try your answer and let you know.

vadian Over a year ago

I updated the answer providing a more suitable solution.

Shivam Pokhriyal Over a year ago

Thanks for the solution!!

Leo Dabus Over a year ago

let sections = dictionary.map(Section.init)

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