A variadic function to see if any number of unsorted arrays all have the same values

areUnsortedArraysEqual.js

const areUnsortedArraysEqual = (...arrs) => {
  const everyEqual = ([first, ...arr], isEqual) =>
    arr.every(item => isEqual(first, item));

  return (
    everyEqual(arrs, (first, arr) => arr.length === first.length) &&
    everyEqual(
      arrs.map(arr =>
        arr.reduce(
          (map, item) => map.set(item, (map.get(item) || 0) + 1),
          new Map()
        )
      ),
      (first, map) =>
        [...new Set([...first.keys(), ...map.keys()])].every(
          item => first.get(item) === map.get(item)
        )
    )
  );
};

console.table(
  Object.assign(
    {},
    ...[
      [[1, 2]], // true
      [[1, 2], [1, 2]], // true
      [[1, 2], [1, 2], [1, 2]], // true
      [[1, 2], [2, 1]], // true
      [[1, 1, 2], [1, 2, 1]], // true
      [[1, 2], [1, 2, 3]], // false
      [[1, 2, 3, 4], [1, 2, 3], [1, 2]], // false
      [[1, 2, 2], [1, 2]], // false
      [[1, 1, 2], [1, 2, 2]], // false
      [[1, 2, 3], [1, 2], [1, 2, 3]] // false
    ].map(arrs => ({
      [arrs
        .map(arr => `[${arr.join(", ")}]`)
        .join(", ")]: areUnsortedArraysEqual(...arrs)
    }))
  )
);