Get object from array of objects in Javascript

Question

I Have this array:

 var arrayExample = [
{productId: 1, quantity: 2, name: example, description: example}, 
{productId: 1, quantity: 2, name: example, description: example}, 
{productId: 1, quantity: 2, name: example, description: example}, 
{productId: 1, quantity: 2, name: example, description: example}];

My question is

How do I get all the items of the array but taking in every object only the productId and quantity? Thus having an array that contains all the objects but only with the two values? The number of the objects of the array is variable

Result:

var arrayExampleNew = [
{productId: 1, quantity: 2}, 
{productId: 1, quantity: 2}, 
{productId: 1, quantity: 2}, 
{productId: 1, quantity: 2}];

sorry for my English

Answer 1

You could just map it

var arrayExample = [{
 productId: 1,
 quantity: 2,
 name: 'example',
 description: 'example'
}, {
 productId: 1,
 quantity: 2,
 name: 'example',
 description: 'example'
}, {
 productId: 1,
 quantity: 2,
 name: 'example',
 description: 'example'
}, {
 productId: 1,
 quantity: 2,
 name: 'example',
 description: 'example'
}];
var arr = arrayExample.map(function(item) {
 return {productId : item.productId, quantity : item.quantity }
});
console.log(arr)

Answer 2

ES2015:

const arrayExampleNew = arrayExample.map(({productId, quantity}) => ({productId, quantity}));