27 lines
443 B
JavaScript
27 lines
443 B
JavaScript
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import { readFileSync } from "fs";
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const input = readFileSync("datastream.txt", "utf-8");
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function checkForDuplicates(arr) {
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const map = new Map();
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arr.forEach(char => {
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map.set(char, true);
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});
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return map.size === 4;
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}
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const arr = ['', '', '', ''];
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let i = 1;
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for(const char of input) {
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arr.shift()
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arr.push(char);
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if(i > 4 && checkForDuplicates(arr)) break;
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i++;
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}
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console.log(i);
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