How to set default value to true/false?

Question

JavaScript

How to set the default value of a variable if it is boolean?
Is it possible to do this through ||some tricky way or do I need to carry out some additional check?

function myFn(a) {
  var b = a || true;
  console.log(b);
}

myFn(false); //true

Answer 1

The "default" argument value is specified inside the function's argument list

function myFn(a = true) {
  var b = a || true;
  console.log(b);
}

myFn(false); //true