使用lodash

Question

創建從對象數組的int數組我有這樣的對象數組：

this.clients=[{firstName:"Tywin", lastName:"Lannister", age:46, id:2}, 
       {firstName:"Arya", lastName:"Starck", age:46, id:-1}, 
       {firstName:"John", lastName:"Snow", age:46, id:12}, 
       {firstName:"Robb", lastName:"Starck", age:46, id:24}]; 

而且這個變量：

我需要循環把所有的對象數組中，並得到所有像這樣：

idArr = [2,-1,12,24] 

我該如何使用lodash實現它？

Answer 1

使用Array#map方法

this.clients=[{firstName:"Tywin", lastName:"Lannister", age:46, id:2}, 
 
       {firstName:"Arya", lastName:"Starck", age:46, id:-1}, 
 
       {firstName:"John", lastName:"Snow", age:46, id:12}, 
 
       {firstName:"Robb", lastName:"Starck", age:46, id:24}]; 
 

 
var idArr = this.clients.map(function(v){ return v.id; }) 
 

 
console.log(idArr);