如何为每两个元素进行映射以进行反应? [英] How do I map for every two elements for react?

问题描述

假设我有一个如下所示的数组:

Let's say I have an array that looks like this:

const array = [0, 1, 2, 3, 4, 5, 6, 7]

我想要做的是对 .map 函数中的每 2 个对象进行迭代，但它需要在我的渲染中看起来像这样(请注意，我使用的是 React Bootstrap):

What I'm trying to do is iterate for every 2 objects in a .map function, but it needs to look like something like this in my render (note that I'm using React Bootstrap):

<Row>
<Col>array[0]</Col>
<Col>array[1]</Col>
</Row>


<Row>
<Col>array[2]</Col>
<Col>array[3]</Col>
</Row>

等等...

因此，对于每 2 个对象，它需要有自己的行，然后在关闭 Row 之前渲染这 2 个对象，如果有更多元素，则开始新的 Row.

So for every 2 objects, it needs to have it's own row, and then render those 2 objects before closing a Row and starting a new Row if it has more elements.

实现这一目标的最佳方法是什么?

What's the best way to achieve this?

推荐答案

简答

转换模型，然后注入视图.

short answer

Transform model, then inject in View.

您需要根据需要将数组转换为矩阵:

You need to convert your array to a matrix as per your need:

const array = [0, 1, 2, 3, 4, 5, 6, 7]

const rows = array.reduce(function (rows, key, index) { 
    return (index % 2 == 0 ? rows.push([key]) 
      : rows[rows.length-1].push(key)) && rows;
  }, []);
  
console.log(rows)

现在，您的模型已转换为这种格式

Now, you have your model is converted to this format

[ [0, 1] , [2, 3] , [4, 5] , [6, 7] ]

现在嵌套循环应该优雅地完成工作:

Now nested loop should do the job with elegance :

rows.map(row => ( 
  <Row >
  { row.map(col => (<Col>{col}</Col>)) }
  </Row>
))

注意:

这个优雅的解决方案背后的工程是准备你的模型，然后你循环.

NOTES:

The engineering behind this elegant solution is to prepare your model, then you loop.

不确定，当组件在循环中呈现时，React 是否仍然需要 id (.e.g: )..

Not sure, if React still requires id in (.e.g: <Compo id="">) when components are rendered in loop..

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