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Patrick Koch
40,498 Pointsthe ! exclamation mark, is used in multiple coding languages to negate the following value, mostly used with boolean values.
! true = false ! false = true
weird at the beginning but in some cases its sweet.
if( ! false ) {
// the code here is executed cause !false = true
} else {
// this code is not executed
}
For your example isEmpty() function for sure ( i don't know for sure) returns true or false, with the "!" before, it returns the opposite of the return so to speak !isEmpty() = is not Empty You are checking if something is not Empty ^^
You could also write a second function called "isNotEmpty()" but can save the time and just put a ! in front.
I hope I could helpt, you gonna use the ! in your future for sure a lot of times. I still have to stop and speak "not" out lout that it makes sense to me ^^
greetings patrick
LaToya Legemah
12,600 PointsI think it means "if the object is not empty." The object can be a string, array, etc.
http://stackoverflow.com/questions/4845711/difference-between-isempty-and-equals