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 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 got the Json "false" from server. I respond as bool but it's Json so it's in browser type is String instead of bool.  So if I run (!data) whenever I want to check "false" == false then they not worked.  So how can I parse bo...
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 usually set object properties like so,  // Boolean this.listening = config.listening || true;   But config.listening is either true or false, and in this case this.listening will always be true because if config.listening is false it will equal tru...
When I get a value or set a value (from the server side, for example) for an input that is a boolean type it comes as "True" or "False" instead of true or false.  For example:  //"True" var isDated = $('.someClass').va...

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