You should use the + operator to build myStr .
+
myStr
var myStr = "This is the start. " + “This is the end.” ;
var myStr = "This is the start. " + "This is the end." ;
Challenge: Concatenating Strings with Plus Operator
Link to the challenge:
You can often save yourself a lot of time by looking at related topics on the forum. If you were to look at recent posts you would see that this has been asked and answered several times in the last hour.