Smalltalk将一个Sorted集合写入文件 [英] Smalltalk write a Sorted Collection to a file

问题描述

假设我有一个名为 whitepages 的SortedCollection，每个记录包含一个 Customer c> name 和 number 。
我想创建一个函数，以这种方式将它们写入文件

let's say i have a SortedCollection called whitepages, each record containing a Customer, with values name and number. I want to create a function which would write them to a file in such way

name1 
number1 
name2
number2

我必须承认Im完全停留在这里。有人可以帮助吗？

I have to admit Im completely stuck here. Could anyone help?

推荐答案

好的，所以我希望你知道如何写入文件。
当你注意到你已经排序集合，我假设 Customer 按你想要的方式排序。

Ok, so I hope you know how to write to file. And as you noticed that you have sorted collection I suppose that Customers are ordered in the way you want.

然后你可以做的是：

(whitepages collect: [ :customer |
  customer name,
  Character cr asString,
  customer number ]) joinUsing: Character cr

方式你会得到一个字符串，你只需要写入文件。还要注意，如果 name 或 number 不是字符串，您可以使用 asString 。

This way you'll get a string that you just need to write to the file. Also note that if name or number are not strings you can use asString on them.

规范化的方式是执行类似的操作：

The canonical way is to do something like:

whitepages do: [ :customer |
  stream
    nextPutAll: customer name;
    cr;
    nextPutAll: customer number;
    cr ]

是写入文件的流。

这篇关于Smalltalk将一个Sorted集合写入文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！