Missing Number

missing-number.js

const profile = {
  name: 'peter',
  age: 55,
  kids: [{
      name: 'jil',
      age: 23
    },
    {
      name: 'peter',
      age: 1
    },
    {
      name: 'bill',
      age: 2
    },
  ]
}

const x = profile.kids.map(kid => kid.age).reduce((total, current) => total += current, profile.age)

const questions = []

function createQuestion(max) {
  const number1 = Math.floor(Math.random() * 10) + 1
  const number2 = Math.floor(Math.random() * 10) + 1
  const answer = number1 + number2
  if (answer > max) {
    return createQuestion(max)
  }
  questions.push({
    number1,
    number2,
    answer
  })
}

while (questions.length < 5) {
  createQuestion(10)
}

function sum(x) {
  return function(y) {
    return y ? sum(x + y) : x
  }
}

const numbers = [1, 2, 4, 5, 6, 7, 8, 9]
console.log(numbers)
for (let i in numbers) {
  if (numbers[+i + 1]) {
    if (numbers[i] - numbers[+i + 1] !== -1) {
      const difference = Math.abs(numbers[i] - numbers[+i + 1])
      const missings = []
      for (let x = 1; x < difference; x++) {
        console.log("missing is" + parseInt(numbers[i]+x))
      }
      break
    }
  }
}