Quotes from Eric Freeman

when you send an object the worker gets a copy of it. Any changes the worker makes will not affect the object in your main page. The worker is executing in a different environment than your main page, so you have no access to objects there. The same is true of objects the worker sends you: you get a copy of them.

So, we recommend specifying the width and height in the tag attributes, and not setting those properties in CSS unless you really mean to scale the canvas.

Yes, workers can access localStorage and make XMLHttpRequests.

The large number of acknowledgments is because we're testing the theory that everyone mentioned in a book acknowledgment will buy at least one copy, probably more, what with relatives and everything. If you'd like to be in the acknowledgment of our next book, and you have a large family, write to us.

Web Workers have a global function named importScripts that you can use to import one or more JavaScript files into your worker. To

If the two values have different types, try to convert them into the same type and then compare them

You can extend your object at any time with new properties. To do this you just specify the new property and give it a value. For

As of HTML5, you are allowed to use all numbers as an element id. As

When you delete a property, you're not just deleting the value of the property, you're deleting the property itself. And, if you try to use fido.dogYears after deleting it, it will evaluate to undefined.

We'd like to keep things flexible;

The type of undefined is undefined. Why?

An expression is anything that evaluates to a value. 3+4

You've probably seen latitude and longitude specfied in both degrees/minutes/seconds, such as (47°38'34'', 122°32'32''), and in decimal values, such as (47.64, -122.54). With the Geolocation API we always use decimal values. If

If you give it an index that is greater than or equal to the length of the string, it returns the empty string.

Here's the short story: functions are objects in JavaScript. In

Also notice that longitude West and latitude South are represented by negative values.

in JavaScript just about everything is an object underneath, even

If I had a dime for every time I've heard that one", thought Larry, knowing that spec-change-no-problem was a fantasy. "And

the constructor always has a prototype property. More

A string is always a primitive unless you create it in a special way using an object constructor. We'll talk about object constructors later. And you can always use the typeof operator on your variable to see if it is of type string or object.

Speaking activates a different part of the brain. If you're trying to understand something, or increase your chance of remembering it later, say it out loud. Better

make sure that we

two forms of the Adapter Pattern: object and class adapters. Class adapters require multiple inheritance. You can implement more

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