javascript - Ember 找到关键元素的平均值

Question

我试图通过选择电影的单个分数并找到平均值来使这个计算属性起作用。这有点棘手，但这是我到目前为止所拥有的...

testing: Ember.computed('movie.title', 'movie.rating', function() {
  return this.get('movie.title') + ', ' + this.get('movie.rating');
}),

averageScore: Ember.computed('review.@each.score', function() { //Used to determine each score of review
  return this.get('review').(function(sum, review) {
    return sum += review.get('score');
  }, 0) / this.get('reviews').get('length');
}),

我知道我遗漏了什么，有什么建议吗？

Answer 1

sum 是内置的:

scores:       Ember.computed.mapBy('review', 'score'),
sumOfScores:  Ember.computed.sum('scores'),
averageScore: Ember.computed('sumOfScores', 'scores.length', function() {
  return this.get('sumOfScores') / this.get('scores.length');
}