how to reformat this javascript array? -

i have variable this

var item = [             {'id': '1', 'quantity': '100'},             {'id': '2', 'quantity': '200'}         ]; 

but need change format

var new_item = {             '1': {'quantity': '100'},             '2': {'quantity': '200'}         }; 

i loop this, errors

for(i=0; i<item.length; i++){             new_item = {                 item[i].id: {'quantity': item[i].quantity}             };         } 

how can change format t__t

update fix:

oh yes need change this

for(i=0; i<item.length; i++){             new_item[item[i].id] = {'quantity': item[i].quantity};         } 

that work, sorry damn question, think i'm sleepy, thx guys ^_^

you need use bracket notation set derived keys. initialize new_item = {} first.

new_item[item[i].id] = {quantity: item[i].quantity} 

note if using ecmascript6 can use computed property names in object initializers so;

new_item = {     [item[i].id]: {quantity: item[i].quantity} } 

however, overwrites new_item each time have last value of array.