Take a look at this fiddle:  http://jsfiddle.net/gD3ax/1/  or here's the full markup   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns=...
[1, 2, 3].indexOf(3) => 2  [1, 2, NaN].indexOf(NaN) => -1  [1, NaN, 3].indexOf(NaN) => -1...
I was asked to filter out NaN, null, 0, false in an array.  Luckily I have answered the question.   function bouncer(arr) {   function filterer(arr) {      return arr > 0|| isNaN(arr) === true;   }   arr = arr.filter(filterer);   return arr; }  //...
I'm trying to add the values of two arrays in javascript  eg. [1,2,1] + [3,2,3,4]    The answer should be  4,4,4,4 but I'm either getting 4,4,4 or 4,4,4,NaN if I change the 1st array length to 4.   I know a 4th number needs to be in the 1st a...
Taken from the underscore.js source:  _.isNaN = function(obj) {   return _.isNumber(obj) && obj != +obj; };   Why did they do it this way? Is the above implementation equivalent to:  _.isNaN = function(obj) {   return obj !== obj; };   If it...
At first this might seem to be like many of the other questions already asked regarding NaN in JavaScript, but I assure you it's not.  I have this piece of code that converts grabs the value from a textbox, and converts it into a date after click...
First of all I want to mention that I know how isNaN() and Number.isNaN() work. I am reading The Definite Guide by David Flanagan and he gives an example for how to check if the value is NaN:  x !== x   This will result in true if and only if x is Na...
Why do programming languages have a NaN value?  Math.floor('string');  //--> NaN   Why not just throw a TypeError?  TypeError: Expected number instead of string   The question is tagged both javascript and language-agnostic because JavaScr...
Testing the isFinite function I see that NaN is an infinite number (even if it's not a number :-)).  isFinite(NaN) // returns false   What's the logic behind this? Why isn't NaN finite?...

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