Basic JavaScript - Concatenating Strings with the Plus Equals Operator

Tell us what’s happening:
hi
could you help me tell me where is the error?

Your code so far

var myStr; "This is the first sentence. ";
myStr+= "This is the second sentence.";

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36

Challenge: Basic JavaScript - Concatenating Strings with the Plus Equals Operator

Link to the challenge:

Hello @alexpach12!

Look closely at the line I quoted above, what do you think is wrong with this? Hoped that helped.