在JavaScript中将数组附加到数组数组

I started working with JavaScript last week in order to create some D3 visualizations, and have become rather stuck on what can only be a very simple task.

我上周开始使用JavaScript来创建一些D3可视化，并且已经变得非常困难于只能是一个非常简单的任务。

I have various data series for different countries, each stored in arrays, e.g.

我有不同国家的各种数据系列，每个数据都存储在数组中，例如

var uk = [1,2,3,4,5,6,7,8],
    us = [8,4,7,3,7,8,3,2],
    fr = [4,6,8,3,2,6,8,4];

I want to create a master array, that contains all of these individual arrays, not concatenated/merged, so:

我想创建一个主数组，它包含所有这些单独的数组，而不是连接/合并，所以：

world = [uk, us, fr, etc]

How do I go about adding the arrays in such a manner so that they do not concatenate together? Note that there are hundreds of countries, and so I can't manually type them in, as above, and that I'm actually extracting them all from a single csv file, so can easily iterate over them as I extract them. Array.push seems to do the same as concat?

如何以这种方式添加数组，以便它们不会连接在一起？请注意，有数百个国家/地区，因此我无法手动输入它们，如上所述，并且我实际上是从单个csv文件中提取它们，因此可以在提取它们时轻松迭代它们。 Array.push似乎和concat一样吗？

Thanks

谢谢

3 个解决方案

#1

you can add multiple arrays to another array with push

您可以使用push将多个数组添加到另一个数组

var worlds = [];
worlds.push(uk);
worlds.push(us);
worlds.push(fr);

You would of course then reference the different subsets/arrays numerically i.e. worlds[0] = the 'uk' data

您当然会在数字上引用不同的子集/数组，即worlds [0] ='uk'数据

You could use an object instead, that way you can access them with a string key and make the code more readable. i.e.

您可以使用对象，这样您就可以使用字符串键访问它们，并使代码更具可读性。即

var worlds = {
  "uk" : uk,
  "us" : us 
};

and access the data like:

并访问如下数据：

worlds.uk // will be the uk dataset/array

要么

worlds["uk"] // which allows you to store "uk" as a variable

N.B. Although not the question, I see you're using D3. D3 has a json method which reads in a json file and uses that as it's data. You might be better of using a json object to hold your data and passing that stright into D3. Here's the D3 docs for .json if it helps.

注：虽然不是问题，但我看到你正在使用D3。 D3有一个json方法，它读取json文件并将其用作数据。您最好使用json对象来保存数据并将其直接传递到D3中。这是.json的D3文档，如果有帮助的话。

It's also possible to pass a csv file to D3, which if you are not editing your data soruce might also be a solution

也可以将csv文件传递给D3，如果你不编辑你的数据，那么也可能是一个解决方案

#2

Array.push seems to do the same as concat?

Array.push似乎和concat一样吗？

Not really, this is why it's different methods. What you indeed want is push. Maybe like this:

不是真的，这就是为什么它的方法不同。你真正想要的是推动。也许是这样的：

world.push(uk, us, fr);

#3

You could very easily add the arrays to another array like so:

您可以非常轻松地将数组添加到另一个数组，如下所示：

var world = [
    uk, 
    us, 
    fr, 
    etc
];

Which is essentially what you have already typed up. It will most definitely work and will not concatenate them together.

这基本上就是你已输入的内容。它肯定会起作用，不会将它们连接在一起。

#1