How can I get array object of unique value using Higher Order Functions of swift [closed]

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Input: var array: [Int] = [1, 2, 3, 1, 3, 4, 2, 1]

Output:

[[1, 1, 1], [2, 2], [3, 3], [4]]

Possible duplicate of Removing duplicate elements from an array in Swift — Maximelc
– Maximelc, Commented Aug 12, 2019 at 9:31

Alexander · Accepted Answer · 2019-08-12 12:08:46Z

4

A solution with Dictionary(grouping:by:)

let array = [1, 2, 3, 1, 3, 4, 2, 1]
let output = Dictionary(grouping: array, by: {$0})
    .values
    .sorted(by: { $0[0] < $1[0] })

edited Aug 12, 2019 at 12:08

Alexander

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answered Aug 12, 2019 at 9:31

vadian

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10 Comments

Trupesh Vaghasiya Over a year ago

Thank you. It's really help me lots.

Trupesh Vaghasiya Over a year ago

Hello @vadian it's return Dictionary not array.

vadian Over a year ago

No, it returns array.

Trupesh Vaghasiya Over a year ago

Yes, I am not use sorted that's why. Thank you.

Alexander Over a year ago

I wonder how this compares to Dictionary(grouping: array, by: { $0 }) .sorted(by: { $0.key < $1.key }) .map { $0.value }, performance-wise

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