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The book I am reading tells me to open up the JavaScript console and try the code "foo: bar".indexOf(":"). I’ve tried it in many ways. I tried removing quotation marks, putting it inside a show() and alert() function. I just can’t seem to tease anything out.
Has something changed in JavaScript? Has the author made a mistake? Am I supposed to get no return? Do I need to append document.write, perhaps? Any help greatly appreciated.
Yes something changed in Firefox 5+
However the console (ctrl-shift-k) still works
In the error console (ctrl-shift-J) you will need to wrap it in alert: