Array iteration in Ruby

Question

I am trying to iterate through an array in Ruby. I using eachmethod but getting the following error message: NoMethodError: undefined method ``each' for "1, 2":String.

I am using jruby-1.6.7. Not sure if that is the problem.

Here is the code:

#!/usr/bin/ruby

puts "Select one of these.\n1. ABC\n2. DEF\n3. GHI\n"

schemas = gets.chomp

len = schemas.size

puts schemas.split(",")

puts schemas[0..len]

schemas.each {|x| puts x}

I need some guidance with iterating through a simple array in Ruby?

Thanks.

I'm not seeing how schemas is an array. If you want to wrap a string to act as an array, then do Array(schemas).each — daremkd
– daremkd, Commented Nov 10, 2014 at 3:16
You do schemas.split(",") but schemas not changes. You can do schemas = schemas.split(",") then use schemas.each {} — dddd1919
– dddd1919, Commented Nov 10, 2014 at 3:26
That worked. I did schemas = schemas.split(",") and that worked. Thank you for the clear explanation. — itsh
– itsh, Commented Nov 10, 2014 at 4:19
Also len has the size of string which should be the size of the array. so len = schemas.split(",").size should be what you must have to iterate through the array of the specified length. — Pramod Solanky
– Pramod Solanky, Commented Nov 10, 2014 at 5:39

davegson · Accepted Answer · 2014-11-10 07:49:20Z

1

You were on the right track:

schemas = gets.chomp
# => "1, 2"

# save the result of split into an array
arr = schemas.split(",")
# => [1, 2]

# loop the array
arr.each { |schema| puts schema }
# => 1
# => 2

You can also do this in one line, though the array won't get saved anywhere.

schemas = gets.chomp
schemas.split(",").each { |schema| puts schema }
# => 1
# => 2

answered Nov 10, 2014 at 7:49

davegson

8,3515 gold badges55 silver badges72 bronze badges

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

Comments

the Tin Man · Accepted Answer · 2014-11-10 19:02:02Z

0

You have the right idea, however you are calling the Array#each method on a String.

schemas = gets.chomp
puts schemas.split(",")

It's true that the String#split method converts a string to an array, however you never actually converted the data type. schemas is still recognized as a string.

What you could do is

schemas = schemas.split(",")

Then

schemas.each{|x| puts x}

edited Nov 10, 2014 at 19:02

the Tin Man

161k44 gold badges222 silver badges308 bronze badges

answered Nov 10, 2014 at 16:46

Darkmouse

1,9495 gold badges28 silver badges52 bronze badges

Collectives™ on Stack Overflow

Array iteration in Ruby

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related