advent-of-code

Entries to advent of code, multiple years
git clone git://git.finwo.net/misc/advent-of-code
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part-02.ts (1088B)

      1 import { lineByLine } from './line-by-line';
      2 import { sum        } from './sum';
      3 
      4 let history        = [];
      5 let sumLast        = null;
      6 let increasedTotal = 0;
      7 
      8 let texts = [
      9   'decreased',
     10   'no change',
     11   'increased',
     12 ];
     13 
     14 (async () => {
     15 
     16   await lineByLine(__dirname + '/input', line => {
     17     if ((!line) || isNaN(line)) return;
     18     const depth = parseInt(line);
     19     history.push(depth);
     20 
     21     while (history.length >= 3) {
     22       const sumCurrent = sum(...history.slice(0,3));
     23       history.shift();
     24 
     25       if (null === sumLast) {
     26         process.stdout.write(`${sumCurrent} (N/A - no previous measurement)\n`);
     27       } else {
     28         const increased = (sumCurrent > sumLast) | 0;
     29         const decreased = (sumCurrent < sumLast) | 0;
     30         increasedTotal += increased;
     31         process.stdout.write(`${sumCurrent} (${texts[1 + increased - decreased]})\n`);
     32       }
     33 
     34       sumLast = sumCurrent;
     35     }
     36 
     37   });
     38 
     39   process.stdout.write('\n\n');
     40   process.stdout.write('---[ REPORT ]---\n');
     41   process.stdout.write(`Increased ${increasedTotal} times\n`);
     42   process.stdout.write('\n');
     43 
     44 })();
     45