Yes, you can always use this:
var tata = Boolean(toto);
And here are some tests:
for (var value of [0, 1, -1, "0", "1", "cat", true, false, undefined, null]) {
console.log(`Boolean(${typeof value} ${value}) is ${Boolean(value)}`);
}
Results:
Boolean(number 0) is false
Boolean(number 1) is true
Boolean(number -1) is true
Boolean(string 0) is true
Boolean(string 1) is true
Boolean(string cat) is true
Boolean(boolean true) is true
Boolean(boolean false) is false
Boolean(undefined undefined) is false
Boolean(object null) is false