aoc2021_day8_part1.js

(function(inp)
{
  let lines = inp.split('\n');
  const oneLength = 2;
  const fourLength = 4;
  const sevenLength = 3;
  const eightLength = 7;
  
  let easycount = lines.reduce((count, line) =>
  {
    if(line.length > 0)
    {
    	let [_, output] = line.split('|');
    	let numbers = output.split(' ');
    	count += numbers.filter(n => n.length == oneLength || n.length == fourLength || n.length == sevenLength || n.length == eightLength).length;
    }
    return count;
  },0);
  
  return easycount;
})(document.querySelector('pre').textContent);