返回最大值或等于javascript

Question

I'm creating a voting system and I have the following object:

var obj1 = { Mcds: 2, Pret: 2, kfc: 2, BK: 1 }

or (depending on the votes) it could be:

var obj2 = { Mcds: 2, Pret: 2, BK: 3 }

What I want is to display the most voted restaurant or restaurants.

I can achieve this with the obj2 example using the following code:

var obj2Keys = Object.keys(obj2);

var mostVoted = obj2Keys.reduce(function(previousValue, currentValue){
    return obj2[previousValue] > obj2[currentValue] ? previousValue : currentValue;
}); // returns 'BK'

When I use the above code on the obj1 example I get 'kfc' what I want is 'kfc' 'Pret' 'Mcds' (in no particular order).

Answer 1

You need to accumulate all the winning names into an array. When you get a tie for the high vote, you add the element to the array; when you get a higher vote, you start a new array.

 var obj1 = { Mcds: 2, Pret: 2, kfc: 2, BK: 1 } var high_vote = 0; var winners; for (var key in obj1) { if (obj1.hasOwnProperty(key)) { if (obj1[key] > high_vote) { winners = [key]; high_vote = obj1[key]; } else if (obj1[key] == high_vote) { winners.push(key); } } } alert(winners); 

Answer 2

Add this below your existing code:

var mostVotedArray = obj2Keys.filter(function(currentValue){
    return obj2[currentValue] == obj2[mostVoted];
});

The new variable will list the "winners" as an array.