Ruby group integer array to range array [duplicate]

Question

Is there an elegant way to group an integer array to a range array in Ruby?

range1 = [*39..45]
#=> [39, 40, 41, 42, 43, 44, 45]

range2 = [*49..52]
#=> [49, 50, 51, 52]

range = range1 + range2
#=> [39, 40, 41, 42, 43, 44, 45, 49, 50, 51, 52]

range.build_ranges
#=> [39..45, 49..52]

Also here: stackoverflow.com/questions/23840815/…

tokland
– tokland

2017-10-19 07:40:29 +00:00
Commented Oct 19, 2017 at 7:40 — tokland
– tokland, Commented Oct 19, 2017 at 7:40

sawa · Accepted Answer · 2017-10-19 07:33:01Z

2

Yes.

Given that the original array is already sorted and uniqued:

[39, 40, 41, 42, 43, 44, 45, 49, 50, 51, 52]
.chunk_while{|i, j| i.next == j}
.map{|a| a.first..a.last}
# => [39..45, 49..52]

answered Oct 19, 2017 at 7:33

sawa

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