Mar 26, 2013 · The variable will become what ever type you assign it. Initially it is undefined. If you assign it 'true' it will become a string, if you assign it true it will become a boolean, if you assign it 1 it will become a number. Subsequent assignments may …

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

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' construct simply checks whether the expression is truthy. In addition, you should never create a boolean using the Boolean constructor function.

Nov 20, 2014 · I am learning javascript and I want to initialize a boolean array in javascript. I tried doing this: var anyBoxesChecked = []; var numeroPerguntas = 5; for(int i=0;i<numeroPerguntas;i++) { anyBoxesChecked.push(false); } But it doesn't work. After googling I only found this way:

If you don't mind the boolean being converted to a number (that is either 0 or 1), you can use the Bitwise XOR Assignment Operator. Like so: bool ^= true; //- toggle value. This is especially good if you use long, descriptive boolean names, EG:

Nov 5, 2008 · Use the strict equality operator (===), which doesn't make any implicit type conversions when the compared variables have different types. This will set isTrueSet to a boolean true if the string is "true" and boolean false if it is string "false" or not set at all. For making it case-insensitive, try:

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 same way as other attributes: element.removeAttribute('disabled'); However, neither of your two examples are boolean attributes! contenteditable

Feb 11, 2015 · For reference, there are several other useful mechanisms of seeing changes, but they generally rely on properties of an object, not just a simple variable. See all the answers on this question: Listening for variable changes. But specifically make sure you read these two: Using a proxy object to track changes. Using getters and setters to track ...

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 "something"; So my question; Is it neater to loose the "=== true" part in the future, or is it good practise to check the type of the variable as well.

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 between small and big font the simplest way is to place te variable outside of the function: