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;
}

This won't work if "0" is passed as the value. Even if the value is zero, isTruthy will return true

@akash-mitra This returns true for "0" and false for 0 because "0" is truthy and 0 is falsy, see MDN

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