Check for duplicate items before adding to storage

thedaviddias / Front-End-Checklist

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Creative Commons Zero v1.0 Universal

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Closed jeshan closed 5 years ago

jeshan commented 5 years ago

Fixes: #327

Please complete these steps and check these boxes (by putting an x inside the brackets) before filing your PR:

[x] Check the commit's or even all commits' message styles matches our requested structure.
[x] Check your code additions will fail neither code linting checks nor unit test.

check for duplicates before adding to storage This can fix other potential issues down the line.