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You'll probably need to create your own function that calculates and returns the number of available/occupied seats in the shuttle. Given that null represents an empty seat, you can have something lik …

Assuming you're on the latest version of the IDE (run update50 to make sure), no need to set any permissions anymore. Perhaps just ensure that the files under bin are executable. If we're considering …

The problem is caused when shuttle.seats[i] is equal to null as you're trying to set the name property of it to PASSENGERS[i]. In other words, there is no name property (or pretty much any other prope …

You can still access the lat and lng of a house using something like HOUSES["Adams House"].lat; // access the lat HOUSES["Adams House"].lng; // access the lng and use these along with a method like …

Yes, pset8 should be graded if it was submitted. It should be graded within a maximum of 2 weeks. For more information, see this! …

Per the documentation, the @ (known as the error control operator) does exactly that PHP supports one error control operator: the at sign (@). When prepended to an expression in PHP, any error m …

I haven't solved this year's pset8 yet, but I guess this may be because getJSON is asynchronous by default — it returns immediately. …

to access the value sent to the server through Javascript, you could give this <select> element an id and access the value of the currently selected option as follows: <!-- HTML --> <select id="my_m …

Carefully add this line at the bottom of that file, which will associate pset8 with the appliance’s "loopback" address (which won’t ever change): 127.0.0.1 pset8 Then save the file and quit …

it appears that you're using a database user called TODO instead of the one that you should be using. recall that you need to specify these settings in a file called config.json!

your US.txt seems to be located under pset8/bin/. you're passing pset8/US.txt as a command-line argument to import. this makes file_exists look under pset8/bin/pset8 which actually doesn't exist. …

Are you sure both session and results are dicts?

Quoting the professor's comment on a post on the course's Facebook group Original Post: In pset8, I am unable to get Google Earth plug-in working on my computer then can i skip this problem ? …

You can think of HOUSES as an associative array. It contains key/value pairs. The keys are the strings (e.g., "Adams House", "Cabot House", etc.) and the values are the objects that are mapped to thes …

You are over-complicating things a little. First you're creating an array of one object. So the correct way to access the value of name in your example is shuttle.seats[j][0].name; Second, you co …