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20 lines
473 B
JavaScript
20 lines
473 B
JavaScript
import { readFileSync } from "fs";
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const t0 = performance.now();
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const lines = readFileSync("input.txt")
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.toString()
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.split(/\r*\n/)
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.filter((e) => e.length > 0);
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const numbers = lines.map((a) =>
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a
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.split("")
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.filter((b) => parseInt(b))
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.join("")
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);
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const combinations = numbers.map((e) => parseInt(e[0] + e[e.length - 1]));
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const sum = combinations.reduce((a, i) => a + i);
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console.log(sum);
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const t1 = performance.now();
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console.log(`Runtime: ${t1 - t0}ms`);
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