如果找到匹配项，则增加数组中的值

Question

所以我有以下数组

// movie.json
// example output (beautified) from: /createvote movie#1,movie#2,movie#3,movie#4
[
  {
    "label": "movie#1",
    "value": "movie#1",
    "voteCount": 0
  },
  {
    "label": "movie#2",
    "value": "movie#2",
    "voteCount": 0
  },
  {
    "label": "movie#3",
    "value": "movie#3",
    "voteCount": 0
  },
  {
    "label": "movie#4",
    "value": "movie#4",
    "voteCount": 0
  }
]

创建使用

movieListArr.map(x => ({label: x, value: x, voteCount: 0}));
    fs.writeFile("movie.json", JSON.stringify( labelArr ), (err) => {
        if (err)
            console.log(err);
        else {
           console.log("writeFile sucess:");
           console.log(fs.readFileSync("movie.json", "utf8"));
        }
    });

我正在尝试将其与以下内容进行比较

interaction.values[0]; // example output: movie#3

这给了我一个人的投票。

我想要做的是，如果用户投票前：movie#3 我想查看movie.json 并为movie#3 将voteCount 加一。老实说，我已经尝试过寻找解决方案，但我似乎无法解决问题。如果有更好的解决方案，而不是通过.json 文件，我也会全力以赴:)

Answer 1

您可以使用Array.find 查找数组中value 属性为'movie#3' 的项，然后将其递增为voteCount 属性。

const movies=[{label:"movie#1",value:"movie#1",voteCount:0},{label:"movie#2",value:"movie#2",voteCount:0},{label:"movie#3",value:"movie#3",voteCount:0},{label:"movie#4",value:"movie#4",voteCount:0}];

const choice = 'movie#3'

function vote(movieList, vote){
  movieList.find(e => e.value == vote).voteCount++;
}

vote(movies, choice)

console.log(movies)

Answer 2

您可以找到对象并增加计数。

const movie = movies.find(( label ) => label === selectd);

if (movie) ++movie.voteCount;