I've found unknown for me code construction on JQuery site. After some formatting it looks like:
function (a,c) {
c==null && (c=a,a=null);
return arguments.length>0
? this.bind(b,a,c)
: this.trigger(b)
}
What does the first line of the function mean? Is it any trick or standard JS code construction?
It's a trick that uses boolean short-circuit evaluation to only do the second half if the first evaluates to true. Perl has this commonly:
<something> or die
where if the first statement failed, the program ends.
Read it as
if (c == null) { c = a; a = null; }