Question

This runs in ActionScript 3 and JavaScript. Why? I know how && and || work, but a list? Is this AS3 specific? Is this in other languages? I’m a mouth breathing PHP/AS2 programmer. Or did everyone already know this and I’m a tool for not reading documentation properly?

AS3

if (true, true, true) {      trace('true?') } //result - 'true?' traced 

JavaScript

if (true, true, true) {     alert('true?'); } //result - 'true?' alert message popped up  if (false, false, false) {     alert('true?'); } else {     alert('false'); } //result - 'false' alert message popped up  if(true, false, false) {     alert('true?'); } else {     alert('false'); } //result - 'false' alert message popped up 

Answer 1

I presume JavaScript has a comma operator like C, which takes multiple arguments and returns the last one. It’s typically used to for loops where you want to initialize more than one value:

for(i=0, j=0; j< 10; j++) {   ...    }