修复

Question

我正在使用Angular2创建一个应用程序，我有一系列派对。

const PARTIES: Party[] = [
  { id: 1, title: "Main Event", description: "The biggest, most extravagant event in the last 10,000,000 years." },
  { id: 2, title: "Secondary Event", description: "The not as biggest, less extravagant event in the last 10,000,000 years." },
  { id: 3, title: "Another Event", description: "N/A" },
  { id: 4, title: "Another Event", description: "N/A" },
  { id: 5, title: "Another Event", description: "N/A" },
  { id: 6, title: "Another Event", description: "N/A" },
  { id: 7, title: "Another Event", description: "N/A" },
  { id: 8, title: "Another Event", description: "N/A" },
  { id: 9, title: "Another Event", description: "N/A" },
  { id: 10, title: "Another Event", description: "N/A" }
];

在保留原始数组的同时，我想将此数组拆分为3个段。

在普通的JavaScript中，我会使用以下内容。

var chunk_size = 3;
var arr = PARTIES;
var groups = arr.map(function(e,i){
    return i%chunk_size===0 ? arr.slice(i,i+chunk_size) : null;
})
.filter(function(e){ return e; });
PARTIES = groups

但是，我正在使用TypeScript。有没有可能的方法来执行我想要使用TypeScript实现的目标？

Answer 1

您的JavaScript代码：

var chunk_size = 3;
var arr = PARTIES;
var groups = arr.map(function(e,i){
    return i%chunk_size===0 ? arr.slice(i,i+chunk_size) : null;
})
.filter(function(e){ return e; });
PARTIES = groups

不正确。如果它是它将是有效的TypeScript 并且它将起作用，因为JavaScript是TypeScript https://basarat.gitbooks.io/typescript/content/docs/why-typescript.html :)

修复

以下是工作样本：

const PARTIES = [
  { id: 1, title: "Main Event", description: "The biggest, most extravagant event in the last 10,000,000 years." },
  { id: 2, title: "Secondary Event", description: "The not as biggest, less extravagant event in the last 10,000,000 years." },
  { id: 3, title: "Another Event", description: "N/A" },
  { id: 4, title: "Another Event", description: "N/A" },
  { id: 5, title: "Another Event", description: "N/A" },
  { id: 6, title: "Another Event", description: "N/A" },
  { id: 7, title: "Another Event", description: "N/A" },
  { id: 8, title: "Another Event", description: "N/A" },
  { id: 9, title: "Another Event", description: "N/A" },
  { id: 10, title: "Another Event", description: "N/A" }
];

var chunk_size = 3;
const groups = PARTIES.map(function(e,i){
    return i%chunk_size===0 ? PARTIES.slice(i,i+chunk_size) : null;
})
.filter(x=>!!x)

console.log(groups);

有关修复的一些注意事项：

const无法重新分配。所以你不能重新分配给PARTIES
PARTIES的类型（[]）与groups（[][]）的类型不同，因此您不想再分配
最好在boolean中使用真filter而不是真值/错误检查。更多：https://basarat.gitbooks.io/typescript/content/docs/tips/truthy.html

如何在Typescript中分隔数组

1 个答案:

修复