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# martinwalsh's solution

## to Anagram in the Crystal Track

Published at Jul 13 2018 · 0 comments
Instructions
Test suite
Solution

#### Note:

This solution was written on an old version of Exercism. The tests below might not correspond to the solution code, and the exercise may have changed since this code was written.

Given a word and a list of possible anagrams, select the correct sublist.

Given `"listen"` and a list of candidates like `"enlists" "google" "inlets" "banana"` the program should return a list containing `"inlets"`.

## Setup

Follow the setup instructions for Crystal here:

http://exercism.io/languages/crystal

More help installing can be found here:

http://crystal-lang.org/docs/installation/index.html

## Making the Test Suit Pass

Execute the tests with:

``````\$ crystal spec
``````

In each test suite all but the first test have been skipped.

Once you get a test passing, you can unskip the next one by changing `pending` to `it`.

## Source

Inspired by the Extreme Startup game https://github.com/rchatley/extreme_startup

## Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

### anagram_spec.cr

``````require "spec"
require "../src/*"

describe "Anagram" do
describe "#find" do
it "detects no anagrams" do
Anagram.find("diaper", ["hello", "world", "zombies", "pants"]).should eq [] of String
end

pending "detects one anagram" do
Anagram.find("ant", ["tan", "stand", "at"]).should eq ["tan"]
end

pending "detects multiple anagrams" do
Anagram.find("master", ["stream", "pigeon", "maters"]).should eq ["stream", "maters"]
end

pending "detects multiple anagrams 2" do
Anagram.find("allergy", ["gallery", "ballerina", "regally", "clergy", "largely", "leading"]).should eq ["gallery", "regally", "largely"]
end

pending "does not detect false positives" do
Anagram.find("galea", ["eagle"]).should eq [] of String
end

pending "does not detect anagram subsets" do
Anagram.find("good", ["dog", "goody"]).should eq [] of String
end

pending "does not detect identical words" do
Anagram.find("corn", ["corn", "dark", "Corn", "rank", "CORN", "cron", "park"]).should eq ["cron"]
end

pending "detects anagrams case-insensitively" do
Anagram.find("Orchestra", ["cashregister", "carthorse", "radishes"]).should eq ["carthorse"]
end

pending "does not detect a word as its own anagram" do
Anagram.find("banana", ["Banana"]).should eq [] of String
end

pending "anagrams must use all letters exactly once" do
Anagram.find("tapper", ["patter"]).should eq [] of String
end
end
end``````
``````module Anagram
extend self

def find(word, candidates)
candidates.select do |candidate|
candidate if word.downcase != candidate.downcase && word.downcase.chars.sort == candidate.downcase.chars.sort
end
end
end``````

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