JavaScript 中如何检查一个数组是否是另一个数组的子集

如何检查一个数组是否是另一个数组的子集？

javascript
function isSubset(array1, array2) {
  for (let i = 0; i < array1.length; i++) {
    if (!array2.includes(array1[i])) {
      return false;
    }
  }
  return true;
}
const array1 = [1, 2, 3];
const array2 = [1, 2, 3, 4, 5];
console.log(isSubset(array1, array2)); // 输出 true

javascript
function isSubset(array1, array2) {
  return array1.every(item => array2.includes(item));
}
const array1 = [1, 2, 3];
const array2 = [1, 2, 3, 4, 5];
console.log(isSubset(array1, array2)); // 输出 true

javascript
function isSubset(array1, array2) {
  const set1 = new Set(array1);
  const set2 = new Set(array2);
  
  return array1.length === set1.size && set1.size === set2.size;
}
const array1 = [1, 2, 3];
const array2 = [1, 2, 3, 4, 5];
console.log(isSubset(array1, array2)); // 输出 true