functional-javascript-workshop/exercises/basic_every_some/solution/solution.js

The basics of functional programming in JavaScript. No libraries required.

module.exports = function checkUsersValid(goodUsers) {
  return function allUsersValid(submittedUsers) {
    return submittedUsers.every(function(submittedUser) {
      return goodUsers.some(function(goodUser) {
        return goodUser.id === submittedUser.id
      })
    })
  }
}