You don’t have to be a JavaScript novice to get confused by this…

 if ([0]) { console.log([0] == true); //false console.log(!![0]); //true } 

 
or this…

 if ("potato") { console.log("potato" == false); //false console.log("potato" == true); //false } 

 
The good news is that there is a standard and all browsers follow it. Some authors will tell you to fear coercion and and code against it. I hope to persuade you that coercion is a feature to be leveraged (or at the very least understood), not avoided…
Continue reading “Truth, Equality and JavaScript” →