RE: How To Determine Index of Duplicate Items in a List

[Itjustmifdhal]

https://community.appinventor.mit.edu/t/how-to-determine-index-of-duplicate-items-in-a-list/4189/3
Hello can you help me find the mistake that I'm doing
I tried my best to follow what you showed me but there have been an error occurred

@ABG

JSON text representation of the dict object.

Also I quite don't understand by the meaning of JSON text representation
And what is the actual result would be

Thank you for helping me before
I hope your guidance can help me finish my school project.

[WatermelonIce]

A json is like the dictionary. A key with a value.

The key in here represent every character, the value is a list of index

[ABG]

Learn about JSON and dictionaries at

FAQ Section: JSON and Dictionaries

The new Dictionaries docs - MIT Blocks based JSON Browser - ABG Blocks based JSON Filter and Lookup - ABG Extracting data from JSON text JSONTools extension - Luke Gackle Web Component – JSON Response On App Inventor - Sajal Dutta

and

Dictionaries and JSON

Here’s the Dictionaries FAQ:

[ABG]

@Itjustmifdhal

Hello can you help me find the mistake that I'm doing
I tried my best to follow what you showed me but there have been an error occurred

What error occurred?

[Itjustmifdhal]

[ABG]

You might be running with an old Companion version, or on an old emulator that does not support dictionaries.

What version of Companion are you running, and
which emulator?

[TIMAI2]

I had a little play with this. based upon the topic title (and the other topic running on this one). My effort takes a simple list that contains duplicates, makes a list of lists using the indexes of each item, then returns the set of unique items in the list and a set of duplicate entries (but not the first of each duplicate)

[ABG]

Please export your project and post it here.

[Itjustmifdhal]

Version 2.55 if i'm not mistaken.

[TIMAI2]

@Itjustmifdhal

Version 2.55

You should update your companion to 2.60 or 2.60u