Quote by Eric Freeman

““NaN never equals any other value, including itself, so to test for NaN use the function isNaN.””

★ ★ ★ ★ ★ 4.5 out of 5 (10 ratings)

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…

Image

“the constructor always has a prototype property. More”

Image

“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…

Image

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

Image

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

Image

“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…

Image

“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…

Image

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

Image

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

Image

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

Image

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

Image

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

Image