How to combine equal sequence elements (functional programming)?

Question

I want to write a function that takes in a sequence <1,1,2,2,3> and returns the sequence with equal elements grouped like <<1,1>, <2,2>, <3>>.

I\'m u

Answer 1

Don't know about the languages you are using, but from functional perspective, I would:

1. take sequence of distinct values
2. map each value in distinct sequence to filtered original sequence.

Pseudo code:

originalSequence = <1,1,2,2,3>
distinctSequence = originalSequnce.distinct() // <1,2,3>
result = distinctSequence.map(elem => originalSequence.filter(e == elem)) // <<1,1>, <2, 2>, <3>>