Check if a value is truthy. The word "truthy" means the value is not one of undefined, null, false, 0, NaN or an empty string "".

isTruthy.js

// Check if a value is truthy. The word truthy means the value is not one of undefined, null, false, 0, NaN or an empty string "".
// Also, you can use the Boolean function to convert the value.
function isTruthy(o) {
    return !!o;
}

"0" should be true. Cast to a number if you want to test for 0