javascript拆分数组取决于名称

我有一个mybooks数组，我想按书的类别将其分开

var mybooks = [
    ['novel','BookName1','$20.00'],
    ['novel','BookName2','$24.00'],
    ['novel','BookName3','$34.00'],
    ['novel','BookName4','$31.00'],
    ['novel','BookName4','$38.00'],
    ['Biograph','BookName5','$28.00'],
    ['Biograph','BookName6','$48.00'],
    ['Biograph','BookName7','$50.00']
  ];

我是这样做的

 for(i=0; i<mybooks.length; i++){
        if ((mybooks[i][0]) == 'novel'){
        var books = mybooks[i];
        console.log(books);
       }
      };

---

如何使名为“splited”的全局变量等于

books

生成函数返回books：

var makeBooks = function(mybooks, type){
  var books=[];
  for(var i=0; i<mybooks.length; i++){
      if ((mybooks[i][0]) === type){
        books.push(mybooks[i]);
      }
  };
  return books;
}

window.splitted = makeBooks(mybooks, 'novel');

var makeBooks=函数（mybooks，类型）{
var账簿=[]；
对于（var i=0；i生成函数返回书籍：

var makeBooks = function(mybooks, type){
  var books=[];
  for(var i=0; i<mybooks.length; i++){
      if ((mybooks[i][0]) === type){
        books.push(mybooks[i]);
      }
  };
  return books;
}

window.splitted = makeBooks(mybooks, 'novel');

var makeBooks=函数（mybooks，类型）{
var账簿=[]；
对于（var i=0；i您是否尝试按图书类别拆分数组？如果是这样，则最好看一看，而不是按图书类别拆分数组？如果是这样，则最好看一看，而不是按图书类别拆分数组。嗯，我不确定最终结果是什么，但您可以这样做：

var splitted = mybooks.reduce(function (result, book) {
    var cat = book[0];

    if (!result[cat]) {
        result[cat] = [book];
    } else {
        result[cat].push(book);
    }

    return result;
}, {});

console.log(splitted); //all books splitted by categories
console.log(splitted.novel); //array of novels
console.log(splitted.Biograph); //array of Biograph

var byType = function(type) {return function(book) {return book[0] == type;};};
var bios = mybooks.filter(byType('Biograph'));

如果您只想一次收集一个类别，还可以使用
过滤器
功能

var novels = mybooks.filter(function (book) {
    return book[0] === 'novel';
});

嗯，我不确定你到底想要什么作为最终结果，但你可以这样做：

var splitted = mybooks.reduce(function (result, book) {
    var cat = book[0];

    if (!result[cat]) {
        result[cat] = [book];
    } else {
        result[cat].push(book);
    }

    return result;
}, {});

console.log(splitted); //all books splitted by categories
console.log(splitted.novel); //array of novels
console.log(splitted.Biograph); //array of Biograph

var byType = function(type) {return function(book) {return book[0] == type;};};
var bios = mybooks.filter(byType('Biograph'));

如果您只想一次收集一个类别，还可以使用
过滤器
功能

var novels = mybooks.filter(function (book) {
    return book[0] === 'novel';
});

一个相当简单的方法是：

var splitted = mybooks.filter(function(book) {return book[0] == 'novel';});

你可以这样概括：

var splitted = mybooks.reduce(function (result, book) {
    var cat = book[0];

    if (!result[cat]) {
        result[cat] = [book];
    } else {
        result[cat].push(book);
    }

    return result;
}, {});

console.log(splitted); //all books splitted by categories
console.log(splitted.novel); //array of novels
console.log(splitted.Biograph); //array of Biograph

var byType = function(type) {return function(book) {return book[0] == type;};};
var bios = mybooks.filter(byType('Biograph'));

一个相当简单的方法是：

var splitted = mybooks.filter(function(book) {return book[0] == 'novel';});

你可以这样概括：

var splitted = mybooks.reduce(function (result, book) {
    var cat = book[0];

    if (!result[cat]) {
        result[cat] = [book];
    } else {
        result[cat].push(book);
    }

    return result;
}, {});

console.log(splitted); //all books splitted by categories
console.log(splitted.novel); //array of novels
console.log(splitted.Biograph); //array of Biograph

var byType = function(type) {return function(book) {return book[0] == type;};};
var bios = mybooks.filter(byType('Biograph'));

这将按类型排列书本数组：

var mybooks = [
    ['novel','BookName1','$20.00'],
    ['novel','BookName2','$24.00'],
    ['novel','BookName3','$34.00'],
    ['novel','BookName4','$31.00'],
    ['novel','BookName4','$38.00'],
    ['Biograph','BookName5','$28.00'],
    ['Biograph','BookName6','$48.00'],
    ['Biograph','BookName7','$50.00']
  ];

var library = {}

for(i=0; i<mybooks.length; i++){
    var bookType = mybooks[i][0];
    if (typeof library[bookType]=='undefined')  
       library[bookType] = [];
    library[bookType].push(mybooks[i]);
}

console.log(library);

var mybooks=[
[“小说”、“书名1”、“20.00美元]，
[“小说”、“书名2”、“24.00美元]，
[“小说”、“书名3”、“34.00美元]，
[“小说”、“书名4”、“31.00美元]，
[“小说”、“书名4”、“38.00美元]，
[‘传记’、‘书名5’、‘28.00美元’]，
[‘传记’、‘书名6’、‘48.00美元’]，
[‘传记’、‘书名7’、‘50美元’]
];
变量库={}
对于（i=0；i，这应该按类型排列您的书籍数组：

var mybooks = [
    ['novel','BookName1','$20.00'],
    ['novel','BookName2','$24.00'],
    ['novel','BookName3','$34.00'],
    ['novel','BookName4','$31.00'],
    ['novel','BookName4','$38.00'],
    ['Biograph','BookName5','$28.00'],
    ['Biograph','BookName6','$48.00'],
    ['Biograph','BookName7','$50.00']
  ];

var library = {}

for(i=0; i<mybooks.length; i++){
    var bookType = mybooks[i][0];
    if (typeof library[bookType]=='undefined')  
       library[bookType] = [];
    library[bookType].push(mybooks[i]);
}

console.log(library);

var mybooks=[
[“小说”、“书名1”、“20.00美元]，
[“小说”、“书名2”、“24.00美元]，
[“小说”、“书名3”、“34.00美元]，
[“小说”、“书名4”、“31.00美元]，
[“小说”、“书名4”、“38.00美元]，
[‘传记’、‘书名5’、‘28.00美元’]，
[‘传记’、‘书名6’、‘48.00美元’]，
[‘传记’、‘书名7’、‘50美元’]
];
变量库={}
对于（i=0；iThanks！但此案例需要是数组：-）谢谢！但此案例需要是数组：-）请确保也查看我的解决方案。它可能会教您一些JavaScript功能；）请确保也查看我的解决方案。它可能会教您一些JavaScript功能；）