If I do this
while((e = data.IndexOf('}', at)) >= 0
&&
(s = data.LastIndexOf('{', at, e-1)) >= 0)
in C#, will the value of e in the second expression already have the value assigned within the while statement?
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3 Answers
You can always try it out.
Short answer: Yes
Long answer: I rather create easier to read code because that kind of programming does not optimize anything. It might be opinion-based but i strongly believe it's a best practice and provides better code maintenance.
while(e = data.IndexOf('}', at)) >= 0)
{
s = data.LastIndexOf('{', at, e-1))
if(s < 0)
break;
//do stuff
}
1 Comment
David S.
Surely you mean less/easier code maintenance with your example, not higher:)
According to the spec, http://msdn.microsoft.com/en-us/library/Aa691322, evaluation is left to right:
For example, in F(i) + G(i++) * H(i), method F is called using the old value of i, then method G is called with the old value of i, and, finally, method H is called with the new value of i.
So yes, e will be assigned to the result of data.IndexOf('}', at), then data.LastIndexOf('{', at, e-1) will use that 'new' e.
Comments
Yes, because you've used && operator, which evaluates left side first to check if evaluation of the right side is necessary.
The conditional-AND operator (
&&) performs a logical-AND of its bool operands, but only evaluates its second operand if necessary.
