正则运用&链式调用的典型例题

Posted 2021-06-04 Jmytea

典型面试题 ，编写满足下列要求的函数
考察点

• javascript基础
• 正则表达式
• 链式调用

// 约定：
// title数据类型为String
// userId为主键，数据类型为Number
var data = [
  {userId: 8,  title: 'title1'},
  {userId: 11, title: 'other'},
  {userId: 15, title: null},
  {userId: 19, title: 'title2'}
];
var find = function(origin) {
  // your code are here...
}
// 查找 data 中，符合条件的数据，并进行排序
var result = find(data).where({
  'title': /\\d$/
}).orderBy('userId', 'desc');
console.log(result);// [{ userId: 19, title: 'title2'}, { userId: 8, title: 'title1' }];

var find = function(origin){
 var result = origin
 var Truefind = function(){
    this.where = function(reg){
        var dataKey = Object.keys(reg)[0]
        result = origin.filter((item)=>{
            return item[dataKey] && item[dataKey].match(reg[dataKey])
        })
        return this
    }
    this.orderBy = function(title, order="desc"){
        result.sort((a,b)=>{
            return order==="desc" ? b[title] - a[title] : a[title] - b[title]
        })
        return result;
    }
 }
 var instance = new Truefind()
 return instance