let list = [
{
id: "1",
content: "A"
},
{
id: "2",
content: "B"
},
{
id: "3",
content: "C"
},
{
id: "4",
content: "D"
}
];
let arr = [
{
id: "1",
content: "C"
},
{
id: "2",
content: "D"
}
];
// let list = [1, 2, 3, 4, 5];
// let arr = [3, 4];
// 去重
function listRemoveRepeat(x) {
let result = [];
for (let i = 0; i < x.length; i++) {
let flag = true;
let temp = x[i];
for (let j = 0; j < result.length; j++) {
// 普通数组 (temp === result[j])
if (temp.id === result[j].id) {
flag = false;
break;
}
}
if (flag) {
result.push(temp);
}
}
return result;
}
// 差集
function listDifference(x, y) {
let clone = x.slice(0);
for (let i = 0; i < y.length; i++) {
let temp = y[i];
for (let j = 0; j < clone.length; j++) {
// 普通数组 (temp === clone[j])
if (temp.id === clone[j].id) {
clone.splice(j, 1);
}
}
}
return listRemoveRepeat(clone);
}
// 并集
function listConcat(x, y) {
return listRemoveRepeat(x.concat(y));
}
// 交集
function listIntersection(x, y) {
let result = [];
for (let i = 0; i < y.length; i++) {
let temp = y[i];
for (let j = 0; j < x.length; j++) {
// 普通数组 (temp === clone[j])
if (temp.id === x[j].id) {
result.push(temp);
break;
}
}
}
return listRemoveRepeat(result);
}
console.log("去重", listRemoveRepeat(list));
console.log("差集", listDifference(list, arr));
console.log("并集", listConcat(list, arr));
console.log("交集", listIntersection(list, arr));