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Remove duplicates from array

Posted on 2006-10-26
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Last Modified: 2010-04-30
I have a program that sends out emails to a generated list separated by semi-colons.  There are never more than 5 addresses but I want to be sure that I don't have any duplicates.  I can load them into an array using split(emails, ";").  How do I sort and remove duplicates?

Thanks,

Traigo
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Question by:traigo
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4 Comments
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 17817264
from the array I would add them to a collection;


dim email as string
dim emails() as string
dim col as collection
dim l as long

email = "a@email.com;b@email.com;a@email.com;c@email.com"
emails = split(email, ";")

set col = new collection
on error resume next
for l = lbound(emails) to ubound(emails)
  email = emails(l)
   'as we have error resume next active, this will ensure that the code continues, although we might try to add a duplicate key here
  col.add email, email
next


here you have a collection of unique email addresses

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LVL 35

Accepted Solution

by:
Raynard7 earned 2000 total points
ID: 17817265
Hi,
I'd use a dictionary (from the microsoft scripting runtime libary)

dictionaries have an exists property for their keys

for a new dictionary I would use

dim dicCheck as new dictionary

I'd split the emails into an array - then foreach element in the array check to see if it is in the array - and if it is then do not add it again

ie

if dicCheck.exists(arrayElement) = false then
    dicCheck.Add arrayElement, 1
end if

then to put everything back out i would do foreach element in dicCheck.Keys and output this into one string
0
 
LVL 19

Expert Comment

by:BrianGEFF719
ID: 17817311
Maybe try something like:

dim emails() as string
dim emailList as string
dim i as long, j as long
dim dupe as boolean

emailList = "a@email.com;b@email.com;a@email.com;c@email.com"
emails = split(emailList,";")
do
dupe = false
for i = lbound(emails) to ubound(emails)
 for j = lbound(emails) to ubound(emails)
  if ((emails(i) = emails(j) )and (i <> j)) then
   emails(i) = ""
   dupe = true
   exit for
 end if
 next j
next i
loop while (dupe)
0
 

Author Comment

by:traigo
ID: 17817338
Thanks for the quick response.  I got it working with raynard7's suggestion.

Dim Dict As Dictionary
Set Dict = New Dictionary
arr = split("me@domain.com;me@domain.com;you@domain.com;me@domain.com", ";")

dim i as long

for i=0 to ubound(arr)
      if dict.exists(arr(i)) = false Then
            dict.add arr(i), 1
      End If
next

dim elem as variant
dim str as string
str = ""
for each elem in dict.keys
str = str & elem & ";"
next

str = Left(str, len(str) - 1)
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