Web Reference: We can also use the += operator to concatenate a string onto the end of an existing string variable. This can be very helpful to break a long string over several lines. In JavaScript, when the + operator is used with a String value, it is called the concatenation operator. You can build a new string out of other strings by concatenating them together. Description The concat() method joins two or more strings. The concat() method does not change the existing strings. The concat() method returns a new string.
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