Android Question String optimization

Alessandro71

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Having a lot of string building statement, I was asking myself what is the best way to handle that, from a performance and memory handling perspective:

B4X: 
newstring = "constant string" & variablestring

or

B4X: 
newstring = $"constant string${variablestring}"$

both produce the same result, but which one generates the best code and runtime performance?
 
Solution
I would guess the & version - it produces less java code
B4X: 
' &
_newstring1 = "constant string"+_variablestring;
' smartstring
_newstring2 = ("constant string"+anywheresoftware.b4a.keywords.Common.SmartStringFormatter("",(Object)(_variablestring))+"");
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Daestrum

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I would guess the & version - it produces less java code
B4X: 
' &
_newstring1 = "constant string"+_variablestring;
' smartstring
_newstring2 = ("constant string"+anywheresoftware.b4a.keywords.Common.SmartStringFormatter("",(Object)(_variablestring))+"");
 
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Solution

Sagenut

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Longtime User
Not sure about what I am about to write, but...
Regular string are Immutable.
So trying to modify it will, with a concatenation with & for example, anyway create an additional new string.
To avoid this it should be used the StringBuilder that will manage mutable string and will effectively reuse the same string.
Here the documentation:
https://www.b4x.com/android/help/core.html#stringbuilder
 
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Alessandro71

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yes, but my use case is not about changing an existing string, rather than creating a new one from exiting ones
 
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Erel

B4X founder
Staff member
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Alessandro71 said:
both produce the same result, but which one generates the best code and runtime performance?
Click to expand...
The performance difference, if there is one, is negligible = no user will ever feel any difference. Use the one that you feel that is simpler.

If you are building very large strings then you should use StringBuilder.
 
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