JavaScript获取两个数组的差集

const arra = ['a', 'b', 'c', 'd', 'e'];
const arrb = ['b', 'e'];
console.log("some: " + arra.filter(v => !arrb.some((item) => item === v)));
console.log("find: " + arra.filter(v => !arrb.find((item) => item === v)));
console.log("findIndex: " + arra.filter(v => arrb.findIndex((item) => item === v) < 0));
console.log("includes: " + arra.filter(v => !arrb.includes(v)));
console.log(arra);

封装方法

function arrayAminusB(arrA, arrB) {
  return arrA.filter(v => !arrB.includes(v));
}