1/**
2 * Created by Liu.Jun on 2020/4/25 10:53.
3 */
4
5// 通过 index 上移
6export function moveUpAt(target, index) {
7    if (index === 0) return false;
8    const item = target[index];
9    const newItems = [item, target[index - 1]];
10    return target.splice(index - 1, 2, ...newItems);
11}
12
13// 通过 index 下移动
14export function moveDownAt(target, index) {
15    if (index === target.length - 1) return false;
16    const item = target[index];
17    const newItems = [target[index + 1], item];
18    return target.splice(index, 2, ...newItems);
19}
20
21// 移除
22export function removeAt(target, index) {
23    // 移除数组中指定位置的元素，返回布尔表示成功与否
24    return !!target.splice(index, 1).length;
25}
26
27// 数组填充对象
28export function fillObj(target, data) {
29    // 简单复制 异常直接抛错
30    try {
31        if (typeof data === 'object') {
32            return target.fill(null).map(() => JSON.parse(JSON.stringify(data)));
33        }
34    } catch (e) {
35        // nothing ...
36    }
37
38    // 默认返回一个 undefined
39    return undefined;
40}
41
42// 切割分为多个数组
43export function cutOff(target, cutOffPointIndex) {
44    return target.reduce((preVal, curVal, curIndex) => {
45        preVal[curIndex > cutOffPointIndex ? 1 : 0].push(curVal);
46        return preVal;
47    }, [[], []]);
48}
49
50// 数组交集
51export function intersection(arr1, arr2) {
52    return arr1.filter(item => arr2.includes(item));
53}
54