Preview:
function Student() {
}

Student.prototype.sayName = function() {
  console.log(this.name)
}

function EighthGrader(name) {
  this.name = name
  this.grade = 8
}

EighthGrader.prototype = Object.create(Student.prototype)

const carl = new EighthGrader("carl")
carl.sayName() // console.logs "carl"
carl.grade // 8
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