String Matching in an Array

Ruby
1

I have an array set up that I want to match the user input to a property
of a sting. However whenever I try to impliment the code the stings
never match and I am returned nil.

The first two ways I tried:
class POlist
def find(lookup)
@purchase_orders.find { |aPOlist| lookup == aPOlist.po_number }

for i in 0…@purchase_orders.length

return @purchase_orders[i] if lookup ==

@purchase_orders[i].po_number

end

return nil

end
end

and the other one:

found_one = false
print "Please Enter a PO: "
find_po = gets
for i in 0…aPOlist.length
if aPOlist[i] == nil then break
end
if find_po.to_s == aPOlist[i].po_number
found_one = true
puts aPOlist[i]
end
end
if found_one == false
puts “PO NOT FOUND”
menu_screen.root
end

2

Forgot to mention I’m trying to match an 8 digit number, but I pretty
sure it’s being stored as a string.

I am taking the values from an Excel worksheet

po_number = worksheet.Range("#{col}#{row}").value

if po_number.length == 8 #the standard Purchase Order length
aPOlist.append(PurchaseOrder.new("#{po_number}", “#{notes}”,
“#{company}”, “#{unit_config}”, “#{due_date}”, “#{quantity.to_i}”))
end

3

Ryan Edwards-crewe wrote:

end

Don’t forget to chomp the input to get rid of the newline:

irb(main):001:0> val = gets
12345678
=> “12345678\n”
irb(main):002:0> val = gets.chomp
12345678
=> “12345678”
irb(main):003:0>

Also, instead of doing

for i in 0…aPOlist.length
#code
end

a prettier way is

aPOlist.each_index do |i|
#code
end

4

Most excellent thank you, it’s working now, it’s always something small
:stuck_out_tongue:
But if you don’t mind me picking your brain, or anyone’s for that
matter. Is there a way I can clear the screen of the console from ruby,
(eg. cls in terminal or windows command prompt), things just get real
messy looking when all it does is scroll.

Thanks.

5

system ‘clear’

Just shell out to the way it is usually done.

mark

6

Thanks Mark and Chris duely noted.

7

Ryan Edwards-crewe wrote:

Posted via http://www.ruby-forum.com/.
use the system command:
system(‘cls’)
Or
cls #note the back-quotes

Note that Array (and anything that mixes in Enumerable) has a #find
method:

anPOlist.find {|aPO| aPO.poNumber == aPOnumber}

will return the first match, or nil if not found

cheers