30 lines
618 B
TypeScript
30 lines
618 B
TypeScript
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const fs = require('fs');
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let input = fs.readFileSync(__dirname + '/input.txt', 'utf8');
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let result = 0;
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const expressions: Array<RegExpMatchArray> = Array.from(input.matchAll(/(do(n't)?)\(\)|mul\((\d{1,3}),(\d{1,3})\)/g));
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let enabled = true;
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expressions.forEach((match) => {
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const expr = match[0];
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// Part 2
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if (expr.startsWith('do(')) {
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enabled = true;
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return;
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}
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if (expr.startsWith('don\'t(')) {
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enabled = false;
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return
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}
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// End part 2
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if (enabled) {
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result += (parseInt(match[3]) * parseInt(match[4]));
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}
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});
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console.log(result);
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