将原始类型的Javascript数组分成多个部分 [英] Partition Javascript array of primitive types into multiple parts

问题描述

我希望能够像这样对原始类型的无序数组进行分区：

I want to be able to partition an unordered array of primitive types like so:

var array = [102,103,104,201,203,204,303,301,302,405,406,408,101];

=>

newArray = [[101,102,103,104],[201,203,204],[303,301,302],[405,406,408]]

根据第一个整数将数组分割成段。

The array gets partitioned into segments based upon the first integer.

数组将根据类似于此表达式的内容进行分区：

The array would be partitioned based on something similar to this expression:

array[i]/100|0 === j;

其中j可以是1,2,3或4。

where j could be 1,2,3, or 4.

例如。 405/100 | 0 === 4 //分区到以4开头的数组。

有谁知道一种方法，我可以根据第一个数字有效地过滤这个数组？

Does anyone know of a way that I could efficiently filter this array into sections based on the first number?

我知道我可以使用lodash分区函数与集合，但我需要初始数组才能成为速度的原始类型。即使这样，分区也只会将数组分成两部分。

I'm aware that I could use the lodash partition function with collections, but I need to inital array to be only primitive types for speed. Even then, the partition would only part the array into 2 parts.

提前致谢！

推荐答案

您可以使用lodash函数链接

You may use lodash function chaining like

var array = [404,101,102,103,104,201,203,204,303,301,302,405,406,408];
var newArray = _(array)
  .groupBy(function (x) { return x / 100 | 0; })
  .values()
  .value();

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