Working out average reviews javascript

Question

I am trying to loop through 3 places and select the place with the highest average reviews and rating.

Say i have the following.

var places = [{
  name: "place 1",
  reviews: 100,
  rating: 5,
},{
  name: "place 2",
  reviews: 10000,
  rating: 5,
},{
  name: "place 3",
  reviews: 10000000,
  rating: 4,
}];

for (i = 0; i < places.length; i++) { 

    // loop through and calculate the highest average reviews
    var rating = places[i].rating;
    var reviews = places[i].reviews;

    // work out the average score place 3 should be the highest

}

http://jsbin.com/loyequluke/edit?js,console,output

Any suggestions what i want to do is find the highest average rating, out of the 3 places.

The correct result would be place 3, but i dont know how to work this out any help please?

Take a moment to look at what you've written. What do you think `(A * B) / B` would even do? — Niet the Dark Absol, Sep 30 '16 at 17:09
any suggestions both this is why i am asking the question? @AndréDion can you explain why i dont have the required data. — user1503606, Sep 30 '16 at 17:11
What do "reviews" and "rating" actually mean? What does it mean to have "reviews: 10000000" and "rating: 4"? — Niet the Dark Absol, Sep 30 '16 at 17:17
@NiettheDarkAbsol so that place has been reviewed 10000000 and been given a rating of average raring of 4 stars. — user1503606, Sep 30 '16 at 17:19
@user1503606 Then how is ‘place 3’ the correct result for the highest average rating?! — Biffen, Sep 30 '16 at 17:21

score 2 · Accepted Answer · answered Sep 30 '16 at 17:21

Please check the code below and let me know if this works for you or not. Since I don't know how you are calculating the highest score, I assume it's (rating * reviews) / rating according to which you get the value. You may run the code snippet given and see the result for yourself. Basically, you have the idea to calculate, this best works for small records with few hundred.

var places = [{
  name: "place 1",
  reviews: 100,
  rating: 5,
},
{
  name: "place 3",
  reviews: 30000000,
  rating: 23,
},

{
  name: "place 2",
  reviews: 10000,
  rating: 5,
},{
  name: "place 3",
  reviews: 10000000,
  rating: 4,
}];

var highest = [];
for (i = 0; i < places.length; i++) { 
    
    // loop through and calculate the highest average reviews
    var rating = places[i].rating;
    var reviews = places[i].reviews;

    highest.push((rating * reviews) / rating);
  
    // work out the average score place 3 should be the highest

}

var highestRating = highest[0];
var pos = 0;

for (i = 0; i < highest.length; i += 1) {
    if (highestRating < highest[i]) {
        highestRating = highest[i];
        pos = i;
    }
}

console.log('Highest Rating: ', highestRating);
console.log('Found at position: ', pos);
console.log('Place with highest score : ', places[pos]);

Let us know if this works for you or not.

I don't know, the average calculation is upto OP, so can't really tell anything about it. — Samundra, Sep 30 '16 at 17:23
Well `(rating * reviews) / rating == reviews`. And are two loops really necessary? — Biffen, Sep 30 '16 at 17:23

Working out average reviews javascript

1 Answers1