Forum Discussion

mohamadelmardin's avatar
mohamadelmardin
New Contributor III
9 years ago

How to render distinct elements only in an array with duplicates

I have a JSON document that has inside an array with duplicate values such as [1,1,3,3,6,1,2,1,2,100]. I am trying to transform/map it from source into target by returning only the distinct values s...
sample_pipeline
Anjali's avatar
Anjali
New Contributor
5 years ago

Can you please explain how this filter function is working? what is item , pos and a here and how there are related to each other and functioning?

cjhoward18's avatar
cjhoward18
Employee
5 years ago

Hi @Anjali

item is the current item it is iterating over in the array, pos is the position in the array for this item and a is the array itself.

The expression to remove duplicates is using the indexOf() to collect a single instance of each unique element in the filter() method since indexOf() returns the first found index for each unique value each time.