How to sort an array in Ruby

Question

Persoane = []
Nume = gets
Persoane.push Nume.split(",")
puts Persoane.sort

I am trying to get an user to input carachters that get split into substrings which get inserted in an array, then the program would output the strings in alphabetical order. It doesnt seem to work and I just get the array's contents, like so:

PS C:\Users\Lenovo\Desktop\Ruby> ruby "c:\Users\Lenovo\Desktop\Ruby\ruby-test.rb"
Scrie numele la persoane
Andrei,Codrin,Bradea
Andrei
Codrin
Bradea
PS C:\Users\Lenovo\Desktop\Ruby>

SarahB · Accepted Answer · 2022-06-07 23:48:38Z

2

you can do this :

Nume = gets
puts Nume.split(",").sort

or in 1 line

array = gets.chomp.split(",").sort

edited Jun 7, 2022 at 23:48

answered Jun 7, 2022 at 23:46

SarahB

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Comments

user1934428 · Accepted Answer · 2022-06-08 06:42:51Z

0

The error is because of your use of push. Let's assume that you define the constant Nume by

Nume='Andrei,Codrin,Bradea'

Then, Nume.split(',') would return the Array ['Andrei', 'Codrin', 'Bradea']. When you do a Persoane.push, the whole array is added to your array Persoane as a single element. Therefore, Persoane contains only one Element, as you can verify when you do a

p Persoane

If you sort a one-element array, the result will also be just that one element - there is nothing to sort.

What you can do is using concat instead of push. This would result in Persoane being a 3-element array which can be sorted.

answered Jun 8, 2022 at 6:42

user1934428

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Comments

mechnicov · Accepted Answer · 2022-06-07 23:37:48Z

0

I'm not sure you need use constants here

If you don't need keep user input and use it somewhere, you can just chain methods like this

persons = gets.chomp.split(",").sort

answered Jun 7, 2022 at 23:37

mechnicov

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1 Comment

Chris Over a year ago

As extraneous whitespace is likely unwanted on the individual names, I would suggest either mapping &:strip on the resulting Array. If you do that, the call to #chomp is unnecessary. Either that or .split(/\s*\,\s*/)

Chris · Accepted Answer · 2022-06-08 01:54:35Z

0

For something a little different, let's not split at all.

people = gets.scan(/[^,]+/).map(&:strip).sort

This will avoid problems like multiple commas in a row yielding empty strings. Of course, you could also avoid that with:

people = gets.split(/\,+/).map(&:strip).sort

answered Jun 8, 2022 at 1:54

Chris

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