Quote by Eric Freeman

““Remember what happens when you call getElementById and the id doesn’t exist in the DOM? You get null. Same thing with getAttribute. If””

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More by Eric Freeman

“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…

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“the constructor always has a prototype property. More”

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“when you assign a value to a variable name that hasn’t been previously declared, it is treated as a new, global variable. So be…

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

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

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“Well, it’s a browser policy, and it says you can’t retrieve data from a domain that is different from the domain the page itself…

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“Math is not a constructor, or even a function. It’s an object. As you know, Math is a built-in object that you can use…

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“When you pass zero to setTimeout, you’re asking JavaScript to run your timeout handler as soon as it possibly can — and this leads…

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“JavaScript doesn’t have a character type. So characters are returned as new strings containing one character.”

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“Closures are often used to capture state for event handlers.”

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“Lexical scope means that we can determine the scope of a variable by reading our code.”

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“Q: Q: You said getElementsByTagName returns a list. Do you mean an array? A: A: It returns an object that you can treat like…

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