Selecting specific elements from an array in JavaScript can be achieved by using various methods and techniques

Currently working on a quiz incentive system where users earn rewards based on the number of correct answers they input. The example array below shows the possible range of correct answers:

var rightAnswers = ['a', 'b', 'c', 'd', 'e', 'f', 'g'];

if (rightAnswers.selectAny(3)) {user receives a star}
else if (rightAnswers.selectAny(6)) {user earns 2 stars}
else if (rightAnswers.selectAny(9) {user is awarded with 3 stars}

I am currently stuck on finding an alternative to my pseudo code method "selectAny()", any suggestions would be greatly appreciated.

javascriptarrays

Answer №1

It seems like you're not looking for a chooseAny function; what you really need is a way to calculate the number of correct answers from a given set of answers and an answerKey.

The provided getTotalCorrect function uses a for-loop and identity comparison to achieve this, while the getStars function can be used to determine the star rating based on the calculated score.

var answerKey = ['a', 'b', 'c', 'd', 'e', 'f', 'g']

function getTotalCorrect (answers, answerKey) {
  for (var correct = 0, i = 0; i < answerKey.length; i++) {
    if (answers[i] === answerKey[i]) correct++
  }
  return correct
}

function getStars (totalCorrect) {
   return (totalCorrect / 3) | 0
}

var totalCorrect = getTotalCorrect(['a', 'a', 'c', 'c', 'e', 'e', 'e'], answerKey)
console.log(totalCorrect) //=> 3

var stars = getStars(totalCorrect)
console.log(stars) //=> 1

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