AJAX & recursion

My javascript code isn't working. Which of the following option is the most likely reason for this?

const book = _.where( books, { author: "Gustave Flaubert" } );

• 'book' must be 'books'

• May have forgotten to include underscore

• should be a var, not a const

Which best describes what debouncing and throttling do?

• Prevents a function from running again too soon after it has already ran

• Directly limits the amount of requests a server is able to receive from you over a given time

• reduces the speed of your network

What is FALSE about using an API?

• It can get expensive

• Makes it easy to get third-party information

• Easy to use because they all have great documentation

• Security can be a concern

How would you get to '17' in this example?

const prices = {

fries: 12,

burgers: [{

cheeseburger : 17

}]};

• prices.burgers[cheeseburger]

• prices.burgers[0].cheeseburger

What is AJAX?

• A multipurpose household disinfectant

• A set of client-side techniques used to create asynchronous web applications

• Asymptomatic Javascript and XML

• Magic

Which of the following is a use case of AJAX ?

• A user can drag by using the mouse, rather than clicking on a button e.g. Google Maps

• Fuzzy filtering when typing into a search engine

• Chat room and messaging

• All of the above

Fill in the blank:

In AJAX, there are _______ ready states

• 1

• 10

• 3

• 4

What should you do to access the information in this obscenely large object?

{ "medications":[{ "aceInhibitors":[{ "name":"lisinopril", "strength":"10 mg Tab", "dose":"1 tab", "route":"PO", "sig":"daily", "pillCount":"#90", "refills":"Refill 3" }], "antianginal":[{ "name":"nitroglycerin", "strength":"0.4 mg Sublingual Tab", "dose":"1 tab", "route":"SL", "sig":"q15min PRN", "pillCount":"#30", "refills":"Refill 1" }], "anticoagulants":[{ "name":"warfarin sodium", "strength":"3 mg Tab", "dose":"1 tab", "route":"PO", "sig":"daily", "pillCount":"#90", "refills":"Refill 3" }], "betaBlocker":[{ "name":"metoprolol tartrate", "strength":"25 mg Tab", "dose":"1 tab"," } ] }

• Format the json first using a tool so I can see what is actually going on in this mess

• Trial and error

• Leave it and come back with a strong coffee

Which of the following functions will add two variables and pass the sum to a callback function after 2 seconds?

• const add = (x, y, callback) => { setTimeout(() => { callback(x + y); }, 2); };

• const add = (x, y, callback) => { setTimeout(() => { callback(x + y); }, 2000); };

• const add = (x, y, callback) => { setTimeout(() => { callback(x + y, 2); }); };

• const add = (x, y, callback) => { setTimeout(() => { callback(x + y, 2000); }); };

What is a callback?

• When you phone someone back after missing their call

• A function that is to be executed after another function has finished executing

• The moment you hope for after interviewing for a job