AoC 3.2

3.2 stdin codegolf of try 2.js

L=require('fs').readFileSync(0,{encoding:'utf8'}).split("\n");B=L[0].length;a=[0,1].map(v=>{n=L.map(l=>parseInt(l,2));for(b=B-1;b>=0&&n.length>1;b--){c=[0,0];n.map(n=>c[n>>b&1]++);n=n.filter(n=>(n>>b&1)==v^(c[0]>c[1]))}return n[0];});console.log(a[0]*a[1])

3.2 try 1.js

function ex2(lines) {
  let o2lines = lines
  let co2lines = lines
  for(let i=0;i<lines[0].length;i++) {
    let counts = [0,0]
    o2lines.forEach(line => {
      counts[+line[i]] += 1
    })
    if(counts[0] > counts[1]) {
      o2lines = o2lines.length > 1 ? o2lines.filter(line => line[i]=='0') : o2lines
    } else {
      o2lines = o2lines.length > 1 ? o2lines.filter(line => line[i]=='1') : o2lines
    }
  }
  for(let i=0;i<lines[0].length;i++) {
    let counts = [0,0]
    co2lines.forEach(line => {
      counts[+line[i]] += 1
    })
    if(counts[0] > counts[1]) {
      co2lines = co2lines.length > 1 ? co2lines.filter(line => line[i]=='1') : co2lines
    } else {
      co2lines = co2lines.length > 1 ? co2lines.filter(line => line[i]=='0') : co2lines
    }
  }
  console.log(parseInt(o2lines[0],2)*parseInt(co2lines[0],2))
}

3.2 try 2.js

function ex2_2(lines) {
  let bits = lines[0].length;
  let a = [0,0];
  for(let val=0;val<2;val++) {
    let numbers = lines.map(line => parseInt(line, 2));
    let bit = bits;
    for(bit=bits-1;bit>= 0&&numbers.length>1;bit--) {
      let c = [0,0];
      numbers.map(n => c[n >> bit & 1]++)
      // console.log(numbers, c);
      numbers = numbers.filter(n=>(n>>bit&1)==val^(c[0]>c[1]))
      if(numbers.length===1) break;
    }
    a[val] = numbers[0]
  }
  console.log(answers)
}