Generate a specific array in ruby

Question

Is there a way to easily generate this array in Ruby?

[[-5,'-5'],[-4,'-4'],[-3,'-3'],[-2,'-2'],[-1,'-1'],[1,'1'],[2,'2'],[3,'3'],[4,'4'],[5,'5']]

Basically, it contains 10 elements from -5 to 5 with an integer key and string value.

What do you mean by simplify? Maybe it would be better if you showed how you were using the array. — 44maagnum
– 44maagnum, Commented Nov 9, 2012 at 1:32
To create a dropdown with those options using best_in_place gem. The integer value is what will be saved on the database. — Martin
– Martin, Commented Nov 9, 2012 at 17:36

Kyle · Accepted Answer · 2012-11-09 03:32:04Z

8

(-5..5).map{ |i| [i, i.to_s] }

doester pointed out that the spec does not include 0, any of these would work:

(-5..5).reject{ |i| i == 0 }.map{ |i| [i, i.to_s] }
(-5..5).reject(&:zero?).map{ |i| [i, i.to_s] }
(-5..5).map{ |i| [i, i.to_s] unless i == 0 }.compact
(-5..5).map{ |i| [i, i.to_s] unless i.zero? }.compact

edited Nov 9, 2012 at 3:32

answered Nov 9, 2012 at 1:32

Kyle

22.3k2 gold badges63 silver badges63 bronze badges

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

2 Comments

doesterr Over a year ago

Either this answer, or the specification is wrong. The spec does not include an [0, "0"] element.

Mark Thomas Over a year ago

My favorite is the one with reject(&:zero?)

doesterr · Accepted Answer · 2012-11-09 01:43:07Z

1

((-5..-1).to_a + (1..5).to_a).map { |i| [i, i.to_s] }

answered Nov 9, 2012 at 1:43

doesterr

3,96522 silver badges27 bronze badges

Collectives™ on Stack Overflow

Generate a specific array in ruby

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related