How to sort an Array of Arrays in Ruby where the first elements is a String

Question

The question is how to sort an Array of Arrays with the following structure:

status = 
 [["Wartend", :pending],
  ["Schufa Check", :schufa_check],
  ["Schufa Key existiert", :schufa_person_key_exists],
  ["LottoIdent", :lotto_ident],
  ["IBAN existiert", :iban_exists],
  ["E-Mail Bestätigung", :email_validation],
  ["SMS Bestätigung", :mobile_validation],
  ["Aktiv", :active],
  ["gesperrt", :locked],
  ["ausgeschlossen", :locked_out],
  ["werden gelöscht", :marked_for_deletion]]

The result should be this:

[["Aktiv", :active], 
 ["ausgeschlossen", :locked_out], 
 ["E-Mail Bestätigung", :email_validation], 
 ["gesperrt", :locked], 
 ["IBAN existiert", :iban_exists], 
 ["LottoIdent", :lotto_ident], 
 ["Schufa Check", :schufa_check], 
 ["Schufa Key existiert", :schufa_person_key_exists], 
 ["SMS Bestätigung", :mobile_validation], 
 ["Wartend", :pending], 
 ["werden gelöscht", :marked_for_deletion]]

steenslag · Accepted Answer · 2015-03-25 20:41:35Z

5

p status.sort_by{|ar| ar.first.downcase}
# =>[["Aktiv", :active], ["ausgeschlossen", :locked_out], ["E-Mail Bestätigung", :email_validation], ["gesperrt", :locked], ["IBAN existiert", :iban_exists], ["LottoIdent", :lotto_ident], ["Schufa Check", :schufa_check], ["Schufa Key existiert", :schufa_person_key_exists], ["SMS Bestätigung", :mobile_validation], ["Wartend", :pending], ["werden gelöscht", :marked_for_deletion]]

answered Mar 25, 2015 at 20:41

steenslag

80.2k16 gold badges144 silver badges174 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

user2864740 · Accepted Answer · 2015-03-25 20:40:07Z

2

A common error is to forget, that the String (in each Array at position a[0]) is upper or lowercase. Naturally the sorting will result in something like:

 "Aktiv",  
 "E-Mail Bestätigung",  
 "IBAN existiert",  
 "LottoIdent",  
 ...,  
 "SMS Bestätigung",  
 "ausgeschlossen",    
 "gesperrt"

So the solution is to use the common Ruby sort method with a block and to downcase the values at position a[0]:

status.sort{|x,y| x[0].downcase <=> y[0].downcase}

edited Mar 25, 2015 at 20:40

user2864740

62.5k15 gold badges159 silver badges234 bronze badges

answered Mar 25, 2015 at 20:30

awenkhh

6,1511 gold badge25 silver badges24 bronze badges

2 Comments

Mark Thomas Over a year ago

or status.sort_by{|x| x[0].downcase}.

JokerMartini Over a year ago

is there an additional flag i can use to determine if it's ascending or descending

Collectives™ on Stack Overflow

How to sort an Array of Arrays in Ruby where the first elements is a String

2 Answers 2

Comments

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related