[рони]

kamii50,

function sameArrays(...args){
  let sum = 0;
  const map = {};
  args.forEach((arr, i) => arr.forEach( key => {
    if(key in map) {
       map[key] += i ? -1 : 1;
       if(map[key] > -1) sum += i ? -1 : 1;
    }
    else {map[key] = 1; sum++}
  }));
  return !sum;
}

console.log(sameArrays([10, 3, 29, 15], [15, 10, 3, 29]))//true
console.log(sameArrays([12, 10, 3], [10, 3, 29, 15]))//false