I need to move backwards through an array, so I have code like this:
for (int i = myArray.Length - 1; i >= 0; i--)
{
// Do something
myArray[i] = 42;
}
Is there a better way of doing this?
Update: I was hoping that maybe C# had some built-in mechanism for this like:
foreachbackwards (int i in myArray)
{
// so easy
}
Update 2: There are better ways. Rune takes the prize with:
for (int i = myArray.Length; i-- > 0; )
{
//do something
}
//or
for (int i = myArray.Length; i --> 0; )
{
// do something
}
which looks even better in regular C (thanks to Twotymz):
for (int i = lengthOfArray; i--; )
{
//do something
}
While admittedly a bit obscure, I would say that the most typographically pleasing way of doing this is
for (int i = myArray.Length; i --> 0; )
{
//do something
}
Looks good to me. If the indexer was unsigned (uint etc), you might have to take that into account. Call me lazy, but in that (unsigned) case, I might just use a counter-variable:
uint pos = arr.Length;
for(uint i = 0; i < arr.Length ; i++)
{
arr[--pos] = 42;
}
(actually, even here you'd need to be careful of cases like arr.Length = uint.MaxValue... maybe a != somewhere... of course, that is a very unlikely case!)