const obj =  { two : 2 }

var { one, two } = obj

console.log(one) // outputs undefined

Sometimes an object will be missing properties we are expecting. We can avoid undefined errors by using default values. Use ES6 object destructuring to add a default value of 1 to the one variable. Ignore the .toString() function (used for validation).

Notes

If you know how to use object destructuring, go ahead and complete this challenge, otherwise check the Resources tab for some examples.