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Lower case and Upper case

I wrote that a variableName = variableName.toLowerCase But it’s undefined. Why is that? Based on https://code.sololearn.com/WKH8JjqXU0Qf/?ref=app

jstouppercase.tolowercase.touppercasetolowercase
5th Jun 2020, 6:00 PM
Sali65
Sali65 - avatar
1 Answer

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