how do i loop an array in ruby?

Question

Hi i just started learning ruby and i'm trying to loop through an array i created looking like this:

server[0] = ['hostname' => 'unknown01', 'ip' => '192.168.0.2', 'port' => '22']
server[1] = ['hostname' => 'unknown02', 'ip' => '192.168.0.3', 'port' => '23']
server[2] = ['hostname' => 'unknown03', 'ip' => '192.168.0.4', 'port' => '24']

i tried using this code:

i=0
server[i].each do |x|
    print x['hostname']
    print x['ip']
    i+=1
end

but it only loops through server[0] how i can loop through server[0-3]

the Tin Man · Accepted Answer · 2012-08-29 23:07:27Z

5

You don't need to use i at all, just do this:

server.each do |x|
    print x['hostname']
    print x['ip']
end

edited Aug 29, 2012 at 23:07

the Tin Man

161k44 gold badges222 silver badges308 bronze badges

answered Aug 29, 2012 at 21:10

c0deNinja

3,9842 gold badges31 silver badges46 bronze badges

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

Comments

the Tin Man · Accepted Answer · 2012-08-29 23:06:54Z

1

What you're doing is setting i to 0, so when you get to the server[i].each, you're calling server[0].each. Even though you increment i that doesn't change what you're enumerating over. The correct code is:

server.each

to enumerate over every element in server.

edited Aug 29, 2012 at 23:06

the Tin Man

161k44 gold badges222 silver badges308 bronze badges

answered Aug 29, 2012 at 21:13

Justin Hamilton

5801 gold badge5 silver badges13 bronze badges

Comments

the Tin Man · Accepted Answer · 2012-08-29 23:08:03Z

This probably isn't doing what you think it is. Since you're putting your key/value pairs inside of square brackets, it winds up being an array of one hash (other languages call them maps and dictionaries). Probably you want to exchange your square brackets with curly brackets like this:

servers = []
servers[0] = {'hostname' => 'unknown01', 'ip' => '192.168.0.2', 'port' => '22'}
servers[1] = {'hostname' => 'unknown02', 'ip' => '192.168.0.3', 'port' => '23'}
servers[2] = {'hostname' => 'unknown03', 'ip' => '192.168.0.4', 'port' => '24'}

But since you're just setting each one by its index, you don't need to build it up this way, you can just place them in their respective positions within the array.

servers = [
  {'hostname' => 'unknown01', 'ip' => '192.168.0.2', 'port' => '22'},
  {'hostname' => 'unknown02', 'ip' => '192.168.0.3', 'port' => '23'},
  {'hostname' => 'unknown03', 'ip' => '192.168.0.4', 'port' => '24'},
]

Then to iterate over each one you can do:

servers.each do |server|
  puts server['hostname']
  puts server['ip']
  puts
end

Collectives™ on Stack Overflow

how do i loop an array in ruby?

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related