CODEWITHSUNDEEP
javascriptarrays
Andy
Andy

Reputation: 21

Java Script. How to choose any few items of array

I'm designing a quiz motivator, i.e. if a user inputs any number of correct answers he's gonna get rewarded with a "star" or smth. The array in a pseudo code below represents a range of correct answers to choose from:

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

if (rightAnswers.chooseAny(3)) {user gets a star}
else if (rightAnswers.chooseAny(6)) {user gets 2 stars}
else if (rightAnswers.chooseAny(9) {user gets 3 stars}

I haven't found anything that would work instead of my pseudo "chooseAny()", any ideas, please?

Upvotes: 0

Views: 51

Answers (1)

gyre
gyre

Reputation: 16779

You probably aren't looking for a chooseAny function; I think what you're really asking for is a way to count how many answers were correct given a set of answers and an answerKey.

The getTotalCorrect function below does that for you using a for-loop and identity comparison, and you can use getStars to determine how many stars should be awarded based on the score that is returned.

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

Upvotes: 1

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