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Simply stated, objects of type String are read only and immutable. The StringBuffer class is used to represent characters that can be modified. The significant performance difference between these two classes is that StringBuffer is faster than String when performing simple concatenations.
The + Operator The same + operator you use for adding two numbers can be used to concatenate two strings. You can also use += , where a += b is a shorthand for a = a + b . If the left hand side of the + operator is a string, JavaScript will coerce the right hand side to a string.
The JavaScript concat() method merges the contents of two or more strings. You can also use the + concatenation operator to merge multiple strings. The concatenation operator is preferred in most cases as it is more concise. Concatenation is a technique used in programming to merge two or more strings into one value.
Reason being : The String concatenate will create a new string object each time (As String is immutable object) , so it will create 3 objects. With String builder only one object will created[StringBuilder is mutable] and the further string gets appended to it.
I was reading this book - Professional Javascript for Web Developers where the author mentions string concatenation is an expensive operation compared to using an array to store strings and then using the join method to create the final string. Curious, I did a couple test here to see how much time it would save and this is what I got -
http://jsbin.com/ivako
Somehow, the Firefox usually produces somewhat similar times to both ways, but in IE, string concatenation is much much faster. So, can this idea now be considered outdated (browsers probably have improved since?
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