how to update an object in array if exists , other wise add it as a new object in the array in javascript?

Question

I have an array of objects

const target = [{name: '[email protected]', selected: false, alertType: 'max'},
{name: '[email protected]', selected: true, alertType: 'clear'},]

now i want to update the array based on name and alertType. for ex: if name and alertType matches then update the selected property. if that doesn't match add a new Object. new Object is

 const = {name: '[email protected]', selected: false, alertType: 'both'}

Well you will obviously have to search your array for an object that has this exact name and alertType. — C3roe
– C3roe, Commented Oct 13, 2021 at 13:09
developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… — user5734311
– user5734311, Commented Oct 13, 2021 at 13:10
Does this answer your question? Modify object property in an array of objects — pilchard
– pilchard, Commented Oct 13, 2021 at 13:16

Terry Lennox · Accepted Answer · 2021-10-13 13:17:07Z

You can use Array.find() to find any matching items. You'd then update if an existing item has been found, or add a new one if not:

const target = [
  {name: '[email protected]', selected: false, alertType: 'max'},
  {name: '[email protected]', selected: true, alertType: 'clear'}
];

const update = { name: '[email protected]', selected: false, alertType: 'both' };

function updateAlerts(input, update) {
    let foundAlert = input.find(alert => ((alert.alertType === update.alertType) && (alert.name === update.name)));
    if (foundAlert) {
        foundAlert.selected = update.selected;
    } else {
        input.push(update);
    }
}

updateAlerts(target,  { name: '[email protected]', selected: false, alertType: 'both' })
console.log(target);
updateAlerts(target,  { name: '[email protected]', selected: true, alertType: 'max' })
console.log(target);

.as-console-wrapper { max-height: 100% !important; top: 0; }

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