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Duplicates in a List

Tool to deduplicate a list. Doubles or duplicates are a repeated redundant information present twice (or more) in a list, usually useless.

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Duplicates in a List -

Tag(s) : Data Processing

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# Duplicates in a List

## Duplicates Detector

 I want to Remove Duplicates (A,B,A ⇒ A,B) List Duplicates (A,B,A ⇒ A) List and Count Duplicates (A,B,A ⇒ A×1) Count Duplicates Exclude Duplicates (A,B,A ⇒ B)

## Answers to Questions (FAQ)

### What is a duplicate? (Definition)

A duplicate is a redundant element (double or triple or more) in a set of elements (a list).

### How to remove doubles in a list?

Indicate / copy-paste items in the List field. dCode detects if the list is a list of terms (one per line) or a list of words (with separator) and finds redundant items repeated more than once in order to un-duplicate.

Example: A,B,C,D,A,B,C,A,B,A can be deduplicated as A,B,C,D (repeated terms were removed)

Be carefull to take into account all writing variants of a same element: ignore accents and diacritics allow to treat words like item and ìtém as a same word twice. Also, ignoring uppercase and lowercase allow to detect/find item and ITEM as a duplication of the same word and delete them.

### How to count doubles in a list?

By listing items, dCode detector counts the number of appearance of each, the list can be sorted to detect the most duplicated ones.

dCode counts duplicates/redundancies, so 2 identical items is counted 1 duplicate. N identical elements is counted N-1.

### Why counting doubles?

There are many applications where the presence of duplicates can be a problem:

— detect and delete duplicate files to free up disk space

— deduplicate data from a database, retaining only one occurrence of each unique/distinct record.

— sending mailings by checking if a list of email addresses contains duplicates in order to filter the list and delete identical emails.

## Source code

dCode retains ownership of the "Duplicates in a List" source code. Except explicit open source licence (indicated Creative Commons / free), the "Duplicates in a List" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, breaker, translator), or the "Duplicates in a List" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, or API access for "Duplicates in a List" are not public, same for offline use on PC, mobile, tablet, iPhone or Android app!
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Cite as source (bibliography):
Duplicates in a List on dCode.fr [online website], retrieved on 2024-09-09, https://www.dcode.fr/duplicates-detector

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## Questions / Comments

Feedback and suggestions are welcome so that dCode offers the best 'Duplicates in a List' tool for free! Thank you!

https://www.dcode.fr/duplicates-detector
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