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=...
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(...
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; }  //...
I am tring to display a text box when a element of class numObj is clicked. For some reason I get NaNNaNaNaNNaNNaNaNaN where I expect to the see the result of the searchForm variable in the code below.  I know that NaN stands for Not a Number. What I...
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...
I'm trying to create a form of scatterplot. I have a custom x-axis and a specific scale for both a-axis. I have implemented a zoom functionality for it as well. So far everything is fine, but when I finally try to plot my data as circles I get tw...
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...

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