When i use let in sololearn, it causes error.Why?
as far as i know in SoloLearn web code will run in Webview (or similar in ios). so if you cant run a code that use let but others can. its most likely that your webview is outdated you can update it here ( https://play.google.com/store/apps/details?id=com.google.android.webview ) in android. idk about ios. sharing the code would help a lot here, since we can point out mor easily what the problem is
Exactly what Taste said, since let works for me fine
Can you post your code for see what is wrong?