javascript - 如何将参数插入多重嵌套数组/对象结构中？

Question

给定以下数据库

DB = [
    {
        genre:'thriller', 
        movies:[
            {
                title:'the usual suspects', release_date:1999
            }
        ]},
        {
        genre:'commedy', 
        movies:[
            {
                title:'pinapple express', release_date:2008
            }
        ]}
]

我想检查其中是否存在类型和电影，如果不存在则添加。

到目前为止我已经有了这个代码。唯一缺少的是，如果电影不存在(已注释掉并加粗)，则将(新)电影推送到类型索引处。

var moviesDB = function (array, genre, movie) {
    var x = []

    for (var i = 0; i < DB.length; i++) {
        x.push(DB[i].genre);
    }

    if(x.includes(genre) == false) {
        DB.push({genre: genre, movies: []});    
    } else {
        console.log("genre already here")
    }

    var y = []

    for (var i = 0; i < DB.length; i++) {
        DB[i].movies.forEach (function (object){
            y.push(object.title)
        })
    }

    if(y.includes(movie) == false) {
        //**push movie into the existing object.**
    } else {
        return `the movie the ${movie} is already in the database!`
    }

    return DB;
}

Sp moviesDB = function (DB, "drama", "A Drama movie") 应该添加一个新的流派对象(戏剧)，并在电影数组中添加一个带有“戏剧电影”的新对象“标题。并且 moviesDB = function (DB, "commedy", "Scary movie") 应该只在现有喜剧流派对象中添加一个带有电影标题的新对象。

DB = [
    {
        genre:'thriller', 
        movies:[
            {
                title:'the usual suspects', release_date:1999
            }
        ]},
        {
        genre:'commedy', 
        movies:[
            {
                title:'pinapple express', release_date:2008
            }
        ]}
]


var moviesDB = function (array, genre, movie) {
    var x = []

    for (var i = 0; i < DB.length; i++) {
        x.push(DB[i].genre);
    }

    if(x.includes(genre) == false) {
        DB.push({genre: genre, movies: []});    
    } else {
        console.log("genre already here")
    }

    var y = []

    for (var i = 0; i < DB.length; i++) {
        DB[i].movies.forEach (function (object){
            y.push(object.title)
        })
    }

    if(y.includes(movie) == false) {
        //**push movie into the existing object.**
    } else {
        return `the movie the ${movie} is already in the database!`
    }

    return DB;
}
console.log(moviesDB(DB, "drama", "A drama movie"))

Answer 1

为了达到预期效果，请将以下代码添加到注释部分

if(y.includes(movie) == false) {
        //**push movie into the existing object.**
      DB.forEach(v => {
        if(v.genre === genre){
          v.movies.push({title: movie})
        }
      })
    } 

说明:如果电影是现有对象，则循环数据库数组并检查类型并推送到电影列表

工作代码供引用

DB = [
    {
        genre:'thriller', 
        movies:[
            {
                title:'the usual suspects', release_date:1999
            }
        ]},
        {
        genre:'commedy', 
        movies:[
            {
                title:'pinapple express', release_date:2008
            }
        ]}
]


var moviesDB = function(DB, genre, movie) {
movie = typeof movie === 'object'? movie.title : movie; // to check whether movie parameter is string or object
    var x = []

    for (var i = 0; i < DB.length; i++) {
        x.push(DB[i].genre);
    }

    if(x.includes(genre) == false) {
        DB.push({genre: genre, movies: []});    
    } else {
        console.log("genre already here")
    }

    var y = []

    for (var i = 0; i < DB.length; i++) {
        DB[i].movies.forEach (function (object){
            y.push(object.title)
        })
    }

    if(y.includes(movie) == false) {
        //**push movie into the existing object.**
      DB.forEach(function(object) {
    if(object.genre === genre){
      object.movies.push({title: movie})
    }
  })
} else {
        return `the movie the ${movie} is already in the database!`
    }

    return DB;
}

console.log(moviesDB(DB, "drama", "A drama movie"))
console.log(moviesDB(DB, "commedy", "Scary movie"))
console.log(moviesDB(DB, 'commedy', 'pinapple express'))

codepen - https://codepen.io/nagasai/pen/oNvymeB?editors=1010