@SalmanA to expand to your correct comment !!(new Boolean(false).valueOf()) // false (because new Boolean returns an instance of a Boolean object, which is truthy, while Boolean(false) or …

In JavaScript && returns its first argument if it is falsy or its second argument if the first argument is truthy; so normalized will be undefined if someString was undefined and so forth. That …

Nov 5, 2008 · Javascript String to Boolean. 19. Javascript check if string if true or false and convert to Boolean. 1 ...

Dec 27, 2010 · Convert values into Boolean form and then take bitwise XOR: Boolean(a) ^ Boolean(b) // === 0 | 1 Note that the result of this expression is a number and not a Boolean. …

Dec 11, 2008 · It's mutually exclusive to its negation: (a == b) and (a != b) always hold opposite Boolean values, with all a and b. In case of doubt, learn by heart the following truth table: …

Mar 3, 2015 · If you just want to check for a primitive value: typeof variable === 'boolean' If for some strange reason you have Booleans created with the constructor, those aren't really …

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 …

Oct 7, 2012 · JavaScript parsing boolean. 2. Javascript If statement with boolean value. 3. return opposite Boolean ...

Jun 9, 2016 · Javascript Boolean Code. 4. Javascript comparing boolean value to True. 0. if statement checking for ...

It's newer than the boolean OR, so it doesn't work on older environments, that's true, however nowadays you should likely be transpiling your code for those. If you cannot or prefer not to, …