正则运用&链式调用的典型例题

Posted 2023-02-22 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