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Is there any better way of doing this?
if(borrar() !== false) { alert('tatatata bum bum bum prapra'); } return false; 
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Use the strict equality (===) operator to check if a variable is equal to false - myVar === false . The strict equality operator will return true if the variable is equal to false , otherwise it will return false .
You can check if a value is either truthy or falsy with the built-in bool() function. According to the Python Documentation, this function: Returns a Boolean value, i.e. one of True or False .
To check if a value is of boolean type, check if the value is equal to false or equal to true , e.g. if (variable === true || variable === false) . Boolean values can only be true and false , so if either condition is met, the value has a type of boolean. Copied!
The Javascript standard defines true and false values as a unique data type called a Javascript boolean. Javascript booleans may be true , false , or (in certain contexts) a value that evaluates to either true or false .
If you want to check for false and alert if not, then no there isn't.
If you use if(val), then anything that evaluates to 'truthy', like a non-empty string, will also pass. So it depends on how stringent your criterion is. Using === and !== is generally considered good practice, to avoid accidentally matching truthy or falsy conditions via JavaScript's implicit boolean tests.
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