如何从数组对象中提取键值

Question

i have object of array like this:

var arr = [{id: 1, url: 'something'},{id: 2, url: 'something2'}];

i want output like this :

[{id:1}, {id:2}]

Thanks in advance

Answer 1

Just use Array#map

 const arr = [{id: 1, url: 'something'},{id: 2, url: 'something2'}]; const mapped = arr.map(({id}) => ({ id })); console.log(mapped); 

In simple form

 const arr = [{id: 1, url: 'something'},{id: 2, url: 'something2'}]; const mapped = arr.map(item => { return { id: item.id };}); console.log(mapped); 

Answer 2

You should use map function to pluck specific key value from object array.

var new_arr= arr.map(function (value, index, array) {

   return {"id": value.id}; 

});

Answer 3

If you can modify the original array, just remove the attr url

 var arr = [{id: 1, url: 'something'},{id: 2, url: 'something2'}]; arr.forEach(o => delete o.url); console.log(arr)