How to toggle a boolean?
So far, the best I’ve got outside of writing a custom function is the ternary:
bool = bool ? false : true;
bool = !bool;
This holds true in most languages.
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:
var inDynamicEditMode = true; // Value is: true (boolean) inDynamicEditMode ^= true; // Value is: 0 (number) inDynamicEditMode ^= true; // Value is: 1 (number) inDynamicEditMode ^= true; // Value is: 0 (number)
This is easier for me to scan than repeating the variable in each line.
This method works in all (major) browsers (and most programming languages).
bool = bool != true;
One of the cases.
Let’s see this in action:
var b = true; console.log(b); // true b = !b; console.log(b); // false b = !b; console.log(b); // true
bool === tool ? bool : tool
if you want the value to hold true if
tool (another boolean) has the same value
I was searching after a toggling method that does the same, except for an inital value of
undefined, where it should become
Here it is:
booly = !(booly != false)