The following shows that "0" is false in Javascript:  >>> "0" == false true  >>> false == "0" true   So why does the following print "ha"?  >>> if ("0") console.log("ha") ha...
in javascript,  var a = ''; var b = (a) ? false : true;   // fixed!   var b will be set to false.  is this a defined behavior that can be relied upon?...
In Python, and maybe in Javascript, the boolean or and and operators return one of the operands, instead of true or false.   In Python, one of the operands is returned: '' || 'hello' == 'hello' In comparison, in PHP: ''...
Many beginner programmers write things like if (myBoolean == true) as opposed to if (myBoolean) as they haven't yet grasped that conditionals don't need to contain a comparison, merely a boolean. When I noted this on twitter it was suggested...
I have a PHP program that uses HTML forms and uses JavaScript for validation.  There's a hidden field in the HTML form containing a boolean value that gets set by PHP, validated on submission by JavaScript, and passed to another PHP page.  When I...
According to the ECMAScript specification, both the unary logical NOT operator (!) and the Boolean() function use the internal function ToBoolean(), and the NOT operator also does a few checks to reverse the result.  So why is a double logical NOT op...
I found out the hard way that bitwise operators on bools don't return bools in JavaScript. I thought it must be a bug, but I looked it up in the ECMAScript spec, and sure enough, it says that the bitwise operators return numbers, not bools. It do...
According to the docs the delete operator should be able to delete properties from objects. I am trying to delete properties of an object that are "falsey".  For example, I assumed the following would remove all of the falsey properties from...
I always assumed that booleans were more efficient than ints at storing an on/off value - considering that's their reason for existence. I recently decided to check if this is true with the help of jsperf, and it came up with some contrary result...

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