What is the difference of + operator and concat() method in JavaScript

Question

The plus ( + ) operator and String.concat() method gives the same result.

plus ( + ) operator;

str1 + str2         


        

Answer 1

There are pretty the same but + is more clear and for sure faster.

Look at this performance test and also see this

It is strongly recommended that assignment operators (+, +=) are used instead of the concat() method.