javascript - How Do I loop this arrays to extract only the orderTotal? -

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how loop array , add ordertotal field inside item object? (0) ordertotal $100 (1) ordertotal $220

var sum = 320;

save sum of both ordertotal field variable

my goal sum of order total fields

[     {         "itemid": "c619d69c-970d-11e7-afd4-e44bb50029cc",         "itemtype": "job",         "item": {         "jobcolor": "18, 2, 218",         "jobtype": "work",         "employeeids": [             "af879a7d-1aec-e111-834a-002590274606"         ],         "note": "",         "jobstatus": "scheduled",         "actualdatetimestart": "9/13/2017 11:00 am",         "ordertotal**": 100,         "orderrefnumber": "",         "ordernumber": 8375,         "ordertype": "estimate",         "siteid": "56f6f468-957c-11e7-b464-b4bf180545bb"     } }, {     "itemid": "f9cf5384-9244-11e7-9bca-e81c6a1ca1cb",     "itemtype": "job",     "item": {         "jobcolor": "255, 126, 0",         "jobtype": "work",         "employeeids": [             "af879a7d-1aec-e111-834a-002590274606"         ],         "note": "",         "jobstatus": "scheduled",         "actualdatetimestart": "9/13/2017 2:00 pm",         "ordergroup": "",         "ordertotal": 220,         "orderrefnumber": "",         "ordernumber": 8367,         "ordertype": "work order",         "siteid": "7e131f90-6657-11e7-8416-875831a581c3"     }

you can reduce array this:

const sum = orders.reduce((acc, order) => acc + order.ordertotal, 0);

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