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parseFloat("NaN")   returns "NaN", but  parseFloat("NaN") == "NaN"   returns false. Now, that's probably a good thing that it does return false, but I don't understand how this is so. Did the JavaScript creat...
I am developing a html page that takes date and displays day. I am using a formula called Zeller's congruence. But in JavaScript the formula returns the Result "NaN". I googled the problem. Couldn't figure out the solution.  Here is t...
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=...
Why is there an isNaN() function in JavaScript whilst isUndefined() must be written as:  typeof(...) != "undefined"   Is there a point I don't see?  In my opinion its really ugly to write this instead of just isUndefined(testValue)....
Was playing around with some code to create an array of 0's and found that for only one value NaN was returned instead of 0. I get this in Chrome, Node, and Firefox.   What's causing the second value to be NaN?   var arr = new Array(32).join(...
I am trying to get the highest number from a simple array:  data = [4, 2, 6, 1, 3, 7, 5, 3];  alert(Math.max(data));   I have read that if even one of the values in the array can't be converted to number, it will return NaN, but in my case, I hav...
Soooooo isNaN is apparently broken in JavaScript, with things like:  isNaN('') isNaN('   ') isNaN(true) isNaN(false) isNaN([0])   Returning false, when they appear to all be... Not a Number...  In ECMAScript 6, the draft includes a ne...
[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; }  //...

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