StringBuilder is very slow

[neuronsupport]

For string concatenation which is faster with Dragome? StringBuilder does not seem to be fast. It uses array and uses array push for append. Is concat method of String faster? what do you recommend?

[neuronsupport]

StringBuilder uses array for concatenation. This is very slow. GWT uses plain javascript strings with StringBuilder. I would recommend taking the GWT approach instead of array.

[neuronsupport]

https://jsperf.com/string-concat-vs-array-join-10000/2

[neuronsupport]

"ScriptHelper.eval*", is this really javascript eval? Or dragome creates raw javascript method for it?

[fpetrola]

Hi @norzak sorry for the delay, ScriptHelper in general creates raw js for eval, but in some particular cases, for example when you are not using a constant string as parameter it uses eval.

[fpetrola]

It seems it could easy to use gwt implementation: https://github.com/gwtproject/gwt/blob/master/user/super/com/google/gwt/emul/java/lang/StringBuilder.java
We can try it

[neuronsupport]

Great. I agree.