Question

第一个代码是我对网络练习的第一个解决方案，它工作正常（通过所有测试），但有很多重复的代码。所以我开始抽象函数，我得到了第二个项目，我认为它应该同样有效，但它没有（它只是传递了一些），我做错了什么？

1）

 class Anagram(strg: String) {

  def matches(words: Seq[String]): Seq[String] = {
    def stylisticDifference(things: Seq[String], text: String): Seq[String] = {
      things.filter(w => w.toLowerCase == text.toLowerCase)
    }
    def essensialSimlitude(things: Seq[String], text: String):Seq[String] = {
      things.filter(w => w.toLowerCase.sorted == text.toLowerCase.sorted)
    }
    essensialSimlitude(words,strg) diff stylisticDifference(words,strg)

  }
}

2）

class Anagram(strg: String) {
  def matches(words: Seq[String]):Seq[String] = {
    def answer(things: Seq[String], text: String, fn: String => String): Seq[String] = {
      things.filter(w => fn(w.toLowerCase) == fn(text.toLowerCase))
    }
    val stringSort = (s: String) => s.sorted
    answer(words,strg, identity) diff answer(words, strg, stringSort)
  }
}

Answer 1

我的猜测：

更改此

answer(words,strg, identity) diff answer(words, strg, stringSort)

到此：

answer(words,strg, stringSort) diff answer(words, strg, identity)

说明：

http://alvinalexander.com/scala/union-intersection-difference-scala-sets

数学上的差异不是可交换的。

scala中的代码抽象

1 个答案: