---
title: "用 Elixir 计算 anagram"
description: "例如："
canonical: https://oozou.com/til/calculate-anagrams-in-elixir-23
locale: zh-Hans
date: 2020-10-13
topic: elixir
---

# 用 Elixir 计算 anagram

> 例如：

Published: 2020-10-13 · Topic: [elixir](https://oozou.com/zh-Hans/til-topics/elixir) ([markdown](https://oozou.com/zh-Hans/til-topics/elixir.md))

> Anagram（易位构词）是把某个单词或词组的字母重新排列后得到的另一个单词或词组，通常每个原始字母都恰好用一次

例如：

- "restful" = "fluster"
- "funeral" = "real fun"
- "adultery" = "true lady"
- "customers" = "store scum"
- "forty five" = "over fifty"

用 *mix new anagram* 创建一个新项目，然后我们来写几个测试用例：

```elixir
defmodule AnagramTest do
  use ExUnit.Case

  test "calculates anagram" do
    assert Anagram.anagram?("restful", "fluster") == true
    assert Anagram.anagram?("funeral", "realfun") == true
    assert Anagram.anagram?("adultery", "truelady") == true
    assert Anagram.anagram?("customers", "storescum") == true
    assert Anagram.anagram?("fortyfive", "overfifty") == true
    assert Anagram.anagram?("fiftyfive", "overfifty") == false
    assert Anagram.anagram?("funeral", "real fun") == false
  end
end
```

接下来我们要写代码：

```elixir
defmodule Anagram do
    def anagram?(a, b) do
    charlist(a) == charlist(b)
  end

  def charlist(w) do
    w |> String.trim() |> String.downcase() |> String.graphemes() |> Enum.sort()
  end
end
```

运行测试 *mix test*：

```shell
Compiling 1 file (.ex)
Generated anagram app
.

Finished in 0.1 seconds
1 test, 0 failures

Randomized with seed 752850
```

完成，现在你有一个 anagram 计算器了！

---

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