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January 12, 2017 15:54
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Alien Dictionary
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var words = [ | |
"wrt", | |
"wrf", | |
"er", | |
"ett", | |
"rftt" | |
] | |
var alphabet = [] | |
var hash = {}; | |
function insert(value) { | |
if (alphabet.indexOf(value) == -1) { | |
alphabet.splice(0, 0, value) | |
} | |
} | |
function findKey(keys) { | |
if (keys.length) { | |
keys.map(function(key) { | |
var values = hash[key] | |
if (values && values.length) { | |
values.map(function(value) { | |
if (keys.indexOf(value) == -1) { | |
insert(value) | |
values.pop(value) | |
} | |
}) | |
delete hash[key] | |
findKey(Object.keys(hash)) | |
} else { | |
insert(key) | |
} | |
}) | |
} | |
} | |
function decoder(words) { | |
words.map(function(word, index, array) { | |
var currentWord = word | |
var nextWord = array[index + 1] | |
if (!nextWord) { return } | |
for (var i = 0; i < currentWord.length; i++) { | |
var currentChar = currentWord.charAt(i) | |
var comparisonChar = nextWord.charAt(i) | |
if (currentChar !== comparisonChar) { | |
if (hash[currentChar] && hash[currentChar].indexOf(comparisonChar) !== -1) { | |
hash[currentChar].push(comparisonChar); | |
} else { | |
hash[currentChar] = [comparisonChar]; | |
} | |
return; | |
} | |
} | |
}) | |
findKey(Object.keys(hash)) | |
console.log(alphabet) | |
} | |
decoder(words) |
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