Advent of Code

aoc-day1.ts

import { assertEquals } from 'https://deno.land/std@0.79.0/testing/asserts.ts'

const numbers = (await Deno.readTextFile('./sample_data/aoc-day1.txt'))
  .split('\n')
  .map(Number)

function* nextNumber(numbers: number[]) {
  for (const value of numbers) {
    yield value
  }
}

function day1x1(numbers: number[], searchNumber: number) {
  const numberSet = new Set(numbers)
  let a = 0

  loop: for (a of nextNumber(numbers)) {
    if (numberSet.has(searchNumber - a)) break loop
  }

  return { a, b: searchNumber - a }
}

function day1x2(numbers: number[], searchNumber: number) {
  const numberSet = new Set(numbers)
  let a = 0
  let b = 0

  loop: for (a of nextNumber(numbers)) {
    for (b of nextNumber(numbers)) {
      if (numberSet.has(searchNumber - a - b)) break loop
    }
  }
  return { a, b, c: searchNumber - a - b }
}

/**
 * Test cases for Day 1
 */
Deno.test('AOC - Day 1 example', async () => {
  const numbers = '1721\n979\n366\n299\n675\n1456'
    .split('\n')
    .map((number) => parseInt(number))
  let { a, b } = day1x1(numbers, 2020)

  console.log(`Found ${a} and ${b}`)
  assertEquals(a * b, 514579)
})

Deno.test('AOC - Day 1 task 1', async () => {
  let { a, b } = day1x1(numbers, 2020)

  console.log(`Found ${a} and ${b}`)
  assertEquals(a * b, 842016)
})

Deno.test('AOC - Day 1 task 2', async () => {
  let { a, b, c } = day1x2(numbers, 2020)

  console.log(`Found ${a} and ${b}`)
  assertEquals(a * b * c, 9199664)
})

Makefile

day01:
	@deno test --allow-read src/aoc-day1.ts