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Home > Forums > Programmers > Languages > Ruby Forum

How to assign the contents of a variable to an array

thread753-1609088
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peterv12 (TechnicalUser)
21 Jun 10 21:25
I have a variable that contains the following:

var1 = "01","02","03","04"

I want to put the contents of that variable into an array.  I'm new to Ruby, so this is something I haven't tried before, and I don't know if it can be done.  I tried:

a1 = Array.[](#{var1})  thinking that that would put the value into the parenthesis.  This puts the entire variable value into the "0" element.  I'm looking to put each of the numbers into their own element, which would leave me with an array with 4 elements, "01" through "04".  Can anyone tell me what I'm doing incorrectly?  Better yet, can anyone tell me how to do this correctly?
Thanks...
mikrom (Programmer)
22 Jun 10 4:01
Something like this

CODE

var1 = '"01","02","03","04"'
puts "var1 = #{var1}"

# split variable into list
var1lst = var1.chomp.split(",")
puts "var1lst = (#{var1lst})"

# process list elements
var1lst.each{|el|
  puts "#{var1lst.index(el)}. element = #{el}"
}
Output:

CODE

var1 = "01","02","03","04"
var1lst = ("01""02""03""04")
0. element = "01"
1. element = "02"
2. element = "03"
3. element = "04"
feherke (Programmer)
22 Jun 10 4:14
Hi

Quote (peterv12):

I want to put the contents of that variable into an array.
Huh ? That is already an array.

CODE --> irb

irb(main):001:0> var1 = "01","02","03","04"
=> ["01", "02", "03", "04"]

irb(main):002:0> var1.class
=> Array

Quote (peterv12):

a1 = Array.[](#{var1})
No idea what are you trying there, but I think you want one of these :

CODE --> irb

irb(main):001:0> var1 = "01","02","03","04"
=> ["01", "02", "03", "04"]

# 1) set another pointer to the same array
irb(main):002:0> a1=var1
=> ["01", "02", "03", "04"]

# 2) copy the content in a new array
irb(main):003:0> *b1=var1 # copy   
=> ["01", "02", "03", "04"]

# the difference is visible when you alter the original
irb(main):004:0> var1[2]='FOO'
=> "FOO"

# 1) the pointer accesses the same content
irb(main):005:0> a1[2]
=> "FOO"

# 2) the copy is a separate object
irb(main):006:0> b1[2]
=> "03"

Feherke.
http://free.rootshell.be/~feherke/

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