Typescript獲取對象數組中的列值數組

Question

我必須從一個對象數組中獲取數組。

數據

var result1 = [
    {id:1, name:'Sandra', type:'user', username:'sandra'},
    {id:2, name:'John', type:'admin', username:'johnny2'},
    {id:3, name:'Peter', type:'user', username:'pete'},
    {id:4, name:'Bobby', type:'user', username:'be_bob'}

我的守則

var data = result1.filter(x => x.id)

預期的O / P.

var data = [1,2,3,4]

我的代碼沒有返回預期的結果。 提前致謝

Answer 1

過濾器僅采用匹配值，您需要使用.map

var data = result1.map(x => x.id);

DEMO

 var result1 = [ {id:1, name:'Sandra', type:'user', username:'sandra'}, {id:2, name:'John', type:'admin', username:'johnny2'}, {id:3, name:'Peter', type:'user', username:'pete'}, {id:4, name:'Bobby', type:'user', username:'be_bob'}]; var data = result1.map(t=>t.id); console.log(data); 

Answer 2

你需要使用地圖

var data = result1.map(x => x.id)