Social Beverage Programme

beverage-buddy.js

// Usage: node matcher.js people-list.txt 2
const people = require('fs').readFileSync(process.argv[2]).toString().split('\n');
const weekNum = Number(process.argv[3]);

const pairs = people
  .map((person, index) => people[(index + weekNum) % people.length])
  .map((person, index, list) => {
    const match = list[list.length - index - 1];

    if (match === person) {
      return [person, list[0]];
    } else {
      return [person, match];
    }
  })
  .map(pair => weekNum % 2 ? pair.reverse() : pair)
  .slice(0, Math.floor((people.length + 1) / 2));

console.log(pairs.map(pair => pair.join(' -> ')).join('\n'));