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What is the remove_dups() method in Euphoria?
Overview
The remove_dups() method is part of the e.sequence, a standard Euphoria library module. It performs a basic operations on sequence variables.
The remove_dups() function loops through a sequence and returns values from such a sequence.
It does this by checking for a duplicate value in such a sequence and returns only one of such values. This returned sequence value has a different sort arrangement, which we can specify using the proc_option parameter.
Syntax
remove_dups(source_data,proc_option)
Parameters
-
source_data: This is the sequence variable from which we want to remove duplicate elements. -
proc_option: This integer value indicates theroutine_idof the duplicate removal option you want. The procedure called by theroutine_idwill determine what type of sorting will be performed on the returned sequence.
Note: The
proc_optionparameter is only a name that can be one ofRD_INPLACE,RD_PRESORTED, orRD_SORT. It is evaluated to an integer called aroutine_id.
The proc_option options
-
RD_INPLACE: This option removes duplicate items with the original order of unique items preserved. -
RD_PRESORTED: With this option, there is an assumption that the items ofsource_dataare already sorted. If this assumption proves false, the only removed duplicates are the values side-by-side, adjacent duplicate items. -
RD_SORT: This checks for unique values throughout the sequence and returns only the unique values sorted in ascending order.
Return value
This function will return a sequence with unique values sorted in an order as indicated.
Example
include std/sequence.e
sequence seq = { 3,6,5,6,2,7,5,5,0,3,3,5,6,7}
sequence result1 = remove_dups(seq, RD_INPLACE)
sequence result2 = remove_dups(seq, RD_SORT)
sequence result3 = remove_dups(seq, RD_PRESORTED)
sequence result4 = remove_dups(seq, RD_PRESORTED)
print(1,result1)
puts(1,"\n")
print(1,result2)
puts(1,"\n")
print(1,result3)
puts(1,"\n")
print(1,result4)
Explanation
- Line 1: We include the
sequence.emodule to access the method. - Line 3: We declare a variable to contain our sequence.
- Lines 4–7: We use the
remove_dups()method. - Lines 9–15: We print the sequences with duplicates removed to the screen.
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