Mar 26, 2013 · If I declare a JavaScript boolean variable like this: var IsLoggedIn; And then initialize it with either true or 1, is that safe? Or will initializing it with 1 make the variable a …

However my idea is that it is better to check whether the variable is a boolean or not, especially since Javascript is a loosetyped language. In the second example a string would also return …

Dec 31, 2014 · The reason this is unexpected is because new Boolean(false) returns an object. In JS, all objects evaluate to a truthy value. This is why your test alerted 'TRUE' since the 'if' …

Oct 7, 2012 · JavaScript parsing boolean. 2. Javascript If statement with boolean value ... Evaluate boolean expression ...

Nov 5, 2008 · var myBool = Boolean("false"); // evaluates to true var myBool = !!"false"; // evaluates to true Any string which isn't the empty string will evaluate to true by using them. …

Mar 6, 2015 · I'm new to jQuery and im just trying to pass a boolean to a function.Ive tried various amendments but still not working ? I'm expecting the alert to be fired isTrue(true); function …

> Boolean(0) //false > Boolean(null) //false > Boolean(undefined) //false all return false, which is similar to Python's check of empty variables. So if you want to write conditional logic around a …

Oct 10, 2016 · Boolean attributes. For boolean attributes, set the attribute with the same-named value: element.setAttribute('disabled', 'disabled'); Removing a boolean attribute works the …

Dec 6, 2014 · To change a boolean to its opposite value you can use negation (! ), for example x = !x means "set x to false if it's truthy or to true if it's falsy". If you want the function to toggle …

Feb 11, 2015 · I crafted this answer to match the original problem illustrated in the question here. For reference, there are several other useful mechanisms of seeing changes, but they …