如何在UnderScore.js中创建嵌套组 [英] How to Create Nested Group By in UnderScore.js

问题描述

我有一个数组我需要根据size_y对它们进行分组;

I have an array I need to group them based on size_y;

[
    {"col":4,"row":1,"size_x":1,"size_y":4}, 
    {"col":2,"row":2,"size_x":1,"size_y":2}, 
    {"col":1,"row":1,"size_x":3,"size_y":1},
    {"col":1,"row":4,"size_x":3,"size_y":1}, 
    {"col":1,"row":5,"size_x":4,"size_y":1}
]

现在，如果size_y为4，我想将所有行分组为小于或等于4.

Now, if size_y is 4 I want to group all the rows less than or equal to 4.

[
    {"col":4,"row":1,"size_x":1,"size_y":4}, 
    {"col":2,"row":2,"size_x":1,"size_y":2}, 
    {"col":1,"row":1,"size_x":3,"size_y":1},
    {"col":1,"row":4,"size_x":3,"size_y":1},
],
[
    {"col":1,"row":5,"size_x":4,"size_y":1}
]

提前感谢。

推荐答案

您可以使用生成器功能和 .splice（）

You can use a generator function and .splice()

let arr = [
    {"col":4,"row":1,"size_x":1,"size_y":4}, 
    {"col":2,"row":2,"size_x":1,"size_y":2}, 
    {"col":1,"row":1,"size_x":3,"size_y":1},
    {"col":1,"row":4,"size_x":3,"size_y":1}, 
    {"col":1,"row":5,"size_x":4,"size_y":1}
];

function* divideBy(a) {
  const [copy, [{size_y}] = copy] = [[...a]];
  while (copy.length) yield copy.splice(0, size_y);
}

let res = [...divideBy(arr)];

console.log(res)

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