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index.ts
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index.ts
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export default function uniqueMorseRepresentations(words: string[]): number {
const translations = words.map((word) =>
Array.from(word)
.map((v) => {
const m = letterToMorse.get(v);
if (typeof m === "undefined") {
throw Error("invalid word");
}
return m;
})
.join("")
);
const seen = new Set<string>(translations);
return seen.size;
}
const MORSE = [
".-",
"-...",
"-.-.",
"-..",
".",
"..-.",
"--.",
"....",
"..",
".---",
"-.-",
".-..",
"--",
"-.",
"---",
".--.",
"--.-",
".-.",
"...",
"-",
"..-",
"...-",
".--",
"-..-",
"-.--",
"--..",
];
const letterToMorse = new Map(
MORSE.map((v, i) => [String.fromCharCode(i + "a".charCodeAt(0)), v]),
);