I am dealing with a JavaScript class set up like this
class Student {
constructor(name, age) {}
}
I am looking for a way to throw an error message if one of the parameters (such as 'name') is not passed. For example:
if (!name) {
return "Oops, you forgot to provide a name"
}
If a value is not provided, the function throwIfMissing() will be called with the default value specified.
function throwIfMissing() {
throw new Error('Missing parameter');
}
class Student{
constructor(mustBeProvided = throwIfMissing()) {
return mustBeProvided;
}
}
var student = new Student(100); //works
console.log(student);
var err = new Student(); // throws Uncaught Error: Missing parameterExamine the arguments object to determine the number of parameters it contains. Simply checking if its value is undefined may not be accurate, as it could have been explicitly assigned the value of undefined.
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