Another Operator Precedence Issue!

jake13jake · #1 01-11-2006, 03:53 PM

this.mode != "jumping"
is not the same as !this.mode == "jumping"
apparently.

ApothiX · #2 01-11-2006, 04:40 PM

Quote:

Originally Posted by jake13jake

this.mode != "jumping"
is not the same as !this.mode == "jumping"
apparently.

and it shouldn't be. You are saying the not of this.mode (which is a boolean) equals jumping (which is a string) So it -should- always return false, no matter what. To fix this just do: !(this.mode == "jumping")

Skyld · #3 01-11-2006, 06:28 PM

Quote:

Originally Posted by jake13jake

this.mode != "jumping"
is not the same as !this.mode == "jumping"
apparently.

Why would it be?

Unless you're surrounding it with brackets, it's treating !this.mode == "jumping" effectively as Not this.mode equal to "jumping", which probably will be even more senseless as "jumping" is not a boolean.

ApothiX · #4 01-11-2006, 06:35 PM

Quote:

Originally Posted by Skyld

Why would it be?

Unless you're surrounding it with brackets, it's treating !this.mode == "jumping" effectively as Not this.mode equal to "jumping", which probably will be even more senseless as "jumping" is not a boolean.

That's exactly what I said, Mister Skyld.

jake13jake · #5 01-11-2006, 09:38 PM

So it tests as a boolean when comparing to a string value and as a floating point when comparing to a floating point? I'm so confused.

ApothiX · #6 01-11-2006, 09:44 PM

Quote:

Originally Posted by jake13jake

So it tests as a boolean when comparing to a string value and as a floating point when comparing to a floating point? I'm so confused.

... what? '!' is a boolean operator, I think !this.stringvalue tests if the string is set or not, ie:

PHP Code:


			
temp.stringval = "Wee";

if(temp.stringval) echo("This should fire.");



temp.stringval = ""; // or unset("temp.stringval");

if(!temp.stringval) echo("This should also fire.");

Lance · #7 01-11-2006, 11:54 PM

Quote:

Originally Posted by jake13jake

So it tests as a boolean when comparing to a string value and as a floating point when comparing to a floating point? I'm so confused.

You're only negating the left side of the comparison (this.mode) in your second case, which (assuming this.mode is a string) is negating a string.

Do you understand how negating a string could cause a problem?