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115 lines
2.2 KiB
115 lines
2.2 KiB
/* 集合相关操作（也就是二维数组）
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---------------------------------------------------------------*/
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'use strict';
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export default {
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/**
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* 判断是否集合
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*/
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isValid(col){
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if(Array.isArray(col) && col.length>0){
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return true;
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}else{
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return false;
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}
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},
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/*
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* 通过id获取集合条目，取得条目
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*/
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find(arr, id, field = 'id') {
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let resData;
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if(this.isValid(arr)){
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resData = arr.find((item)=>{
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return typeof item[field] !== 'undefined' && item[field] == id;
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});
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}
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return resData;
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},
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/*
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* 通过id获取集合数组的键值
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*/
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findIndex(arr, id, field = 'id') {
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let resData = -1;
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if(this.isValid(arr)){
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resData = arr.findIndex((item)=>{
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return typeof item[field] !== 'undefined' && item[field] == id;
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});
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}
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return resData;
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},
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/*
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* 通过id删除某个键值
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*/
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del(arr, id, field = 'id') {
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let index = -1;
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if(this.isValid(arr)){
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index = arr.findIndex((item)=>{
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return typeof item[field] !== 'undefined' && item[field] == id;
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});
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}
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if(index !== -1){
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arr.splice(index, 1);
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}
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},
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/*
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* 批量全部赋值
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* 注：会修改源集合数组
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*/
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batchAssign(arr, val, field = 'id') {
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if(this.isValid(arr)){
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arr = arr.map((item)=>{
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if (typeof item[field] !== 'undefined') {
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item[field] = val;
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}
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return item;
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});
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}
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return arr;
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},
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/**
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* 二维对象集合转为一维集合
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* 例: {a:[{x:1}], b:[{x:2}]} => [{x:1}, {x:2}]
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*/
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reduceOne(obj) {
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let res = [];
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for (let k in obj) {
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if (Array.isArray(obj[k])) {
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res = res.concat(obj[k]);
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}
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}
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return res;
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},
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/**
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* 把集合转为一维数组
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* 例: [{x:1,y:99}, {x:2, y: 100}] => [99, 100]
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*/
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pluck(col, field) {
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return col.map(function(item) {
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return item[field];
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});
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},
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/**
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* 集合按指定建分组
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*/
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groupBy(col, field){
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if(this.isValid(col)){
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let res = {};
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col.forEach((item) => {
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if(typeof item[field] !== 'undefined'){
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if(typeof res[ item[field] ] === 'undefined'){
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res[ item[field] ] = [];
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}
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res[ item[field] ].push(item);
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}
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});
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return res;
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}else{
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return {};
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}
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}
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};
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