Sorting part of an array in Ruby

Question

I have a ruby array, and I want to sort all elements starting with index i till index j, in place. The rest of the array should not be modified. How can I implement this?

Well-worded question. @CodeGnome, admit it: you've been proved wrong. :-) — Cary Swoveland
– Cary Swoveland, Commented Apr 18, 2015 at 20:02

JuniorCompressor · Accepted Answer · 2015-04-18 20:36:03Z

21

You can use the a[i, j] = a[i, j].sort! to sort from index i to index j. Example:

a = [8, 7, 5, 4, 3]
a[2..4] = a[2..4].sort!
a # => [8, 7, 3, 4, 5]

edited Apr 18, 2015 at 20:36

answered Apr 18, 2015 at 19:12

JuniorCompressor

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4 Comments

SwiftMango Over a year ago

I was going to comment it won't do what OP wants, but the change is good

Cary Swoveland Over a year ago

Very nice, it seems you're on a roll today.

Cary Swoveland Over a year ago

a[2..4] = a[2..4].sort! would be marginally more efficient, as it creates only one temporary array.

Jochem Schulenklopper Over a year ago

The example is correct, showing how to slice the array using a range, 2..4. The first line is not correct, as a[i, j] = a[i, j].sort does not sort from index i to index j, but sorts from index i and then a length of j.

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