Duplicate string in the string array

RE: Duplicate string in the string array

PhilB — Thu, 22 Mar 2018 14:00:13 GMT

As has said, there's no one function for this. You might find it useful to refer to the searchable list of functions here: docs.appian.com/.../Appian_Functions.html

RE: Duplicate string in the string array

Mike Schmitt — Wed, 21 Mar 2018 18:21:54 GMT

There is no direct (out-of-box) function for this as far as I'm aware; in the past I've implemented this as a global Expression Rule which can receive any array and returns the duplicated members of that array, so that i can have consistency across my system (and not need to type out all that code over and over again).

RE: Duplicate string in the string array

bhargavip — Wed, 21 Mar 2018 17:53:16 GMT

Thanks @Mike and vimalkumars your answers gave me what I want. But I was just looking for one function if we have directly so that reduces code.

RE: Duplicate string in the string array

Mike Schmitt — Wed, 21 Mar 2018 17:33:48 GMT

So far the only solution that correctly addresses your requirement (returning the duplicated value(s), not returning a duplicates-removed array) was the answer submitted by vimalkumars above. I will provide my version here, slightly cleaner (imho) and removing one error in Vimal's version.

with(
  
  /* example array - this can be replaced logically with whatever you need */
  local!items: {"one", "two", "one", "three"},
  
  local!duplicatesRemoved: union(local!items, local!items), /* in your environment, i suggest implementing a global rule to handle de-duplicating arrays, in case a better solution than "union" is found in the future */
  
  a!forEach(
    items: local!duplicatesRemoved,
    expression: if(
      apn_arraylength(wherecontains(fv!item, local!items)) > 1,
      fv!item,
      /* we need to return an empty set here (instead of 'null()') to avoid returning nulls in the resulting array */
      {}
    )
  )
)

Note that the "if" statement needs to return an empty set instead of "null", or else the resulting array will contain nulls along with the duplicate members, instead of just the duplicate members.

RE: Duplicate string in the string array

Vinay Kumar Rai — Wed, 21 Mar 2018 11:10:40 GMT

Use intersection function

=load(

  local!StringInput: {"one","two","one","three"},
  
  intersection(local!StringInput,local!StringInput)
  
)

RE: Duplicate string in the string array

vimalkumars — Wed, 21 Mar 2018 10:33:39 GMT

Hi bhargavip,

Assuming if the array is {"one","two","one","three"} and if you are looking for the duplicate values in this array which is {"one"}.

You can use the below code for this

reject(
  fn!isnull,
  a!forEach(
    items: union({"one","two","one","three"},{"one","two","one","three"}),
    expression: if(
      count(
        wherecontains( fv!item, {"one","two","one","three"})) > 1,
        fv!item,
        null
      )
  )
)

RE: Duplicate string in the string array

aloks0189 — Wed, 21 Mar 2018 08:00:31 GMT

Hi bhargavip you can use following code to achieve your requirement

union({"a","b","a","c"},{"a","b","c","a"})

Assume {"a","b","a","c"} is the array which is available in a variable

RE: Duplicate string in the string array

Sudha — Wed, 21 Mar 2018 06:04:41 GMT

Union() -Remove the duplicates from an array by comparing it with an empty array of the same type:

union({1, 2, 3, 4, 1, 2}, tointeger({})) returns and array with 1, 2, 3, 4

Values are matched with case sensitivity

RE: Duplicate string in the string array

Sudha — Wed, 21 Mar 2018 06:01:26 GMT

Hi,
Could you please try the union().

Thanks,
Sudha.P