Question

Where are the conditionals (if any) and executable parts in:

(o = k + 1 < a.length && a.charAt(k + 1) == o) && k++;

From jQuery date picker.

Answer 1

You can take this step by step.

First, let’s add in all the remaining parentheses, using the operator precedence rules of JavaScript:

( o = (((k + 1) < a.length) && (a.charAt(k + 1) == o)) ) && k++;

So it says

1. Compute the value (k+1) < a.length. It will be either true or false.
2. If this is false assign false to o, otherwise assign the value (a.charAt(k + 1) == o) to o.
3. If you assigned false to o you are done.
4. Otherwise increment k.