runion.cc/

From YUI’s YAHOO object:

        for (j=(d[0] == "YAHOO") ? 1 : 0; j<d.length; j++) {
            o[d[j]]=o[d[j]] || {};
            o=o[d[j]];
        }

pretty concise. Let’s break it down.

(expression) ? 1 : 0

Take a look at Ternary Operators.

variable = (condition) ? what to store if true : what to store if not true;

So if d[0] has a value of “YAHOO”, then j gets assigned 1. Otherwise 0.
So the for loop runs either d.length times or (d.length - 1) times if (d[0] == “YAHOO”) evaluates to true.

Inside the loop? No freakin’ clue, especially out of context. Don’t know what o is, or d, or d.length, so it’s hard to say.
Also, we’d have to know under what circumstances o[d[j]] could evaluate to false. When that happens, the function assigns { } to that value (meaning that it will be defined as an empty array), which is then assigned to o.

Whatever o is.

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