如何检查 object 密钥并替换其值？

Question

I have an object in form of:

let serviceData = [{title: "Template 1", note: "One time fee", usd: "200", eur: "185", gbp: "165"},
{title: "Template 2", note: "Monthly", usd: "200", eur: "185", gbp: "165"},
{title: "Template 3", note: "One time fee", usd: "200", eur: "185", gbp: "165"}]

What's the standard way to perform a check on the key note to see if it's equal to monthly or not, and if it is to replace the value of usd by multiplying it by 12 and returning the updated object?

Answer 1

You can loop through and modify the objects in place:

for (const obj of serviceData) {
    if (obj.note === "Monthly") {
        obj.usd *= 12;
    }
}

If you don't want to clobber the original array, you can make a copy by map ping it:

const modifiedData = serviceData.map(obj => {
    if (obj.note === "Monthly") {
        return {...obj, note: obj.note * 12};
    }
    return {...obj};
});

This utilizes object spread syntax .