I am a beginner myself so i may be wrong but i believe that {} is not needed if the function of the if statement is all on one line. if the if statement has no {}, then it will check for the code bellow or on the same line to the parameters of the if statement for the code corresponding to the if statement. This won't work if your if statement has more than one line under it.

is it javascript in if else statement, doesn't need a curly bracket?
I am a beginner of coding staff :D