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What is " try, catch, substring " in js

What means try/catch/substring in Javascript? I search sololearn for Js Calculator amd I found almost everycode try,catch,substring. What this thing actually do?? https://code.sololearn.com/Wn1zuQvMeOXZ/?ref=app

calculatortrycatchjs
18th Nov 2019, 11:05 AM
Emon Hossain Foysal
Emon Hossain Foysal - avatar
2 Antwoorden
+ 1
Ok. Thanks. I got it
19th Nov 2019, 10:41 AM
Emon Hossain Foysal
Emon Hossain Foysal - avatar

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