Extract JSON object properties into new array with Javascript

Question

I have a over 100+ JSON objects with this format:

{
"grants":[
{
    "grant":0,
    "ID": "EP/E027261/1",
    "Title": "Semiconductor Research at the Materials-Device Interface",
    "PIID": "6674",
    "Scheme": "Platform Grants",
    "StartDate": "01/05/2007",
    "EndDate": "31/10/2012",
    "Value": "800579"
}, ... more grants

I want to be able to grab EndDate and Value into a new array. Like the following output.

"extractedGrants":[
{
    "EndDate": "31/10/2012",
    "Value": "800579"
}, ... more extracted objects with EndDate and Value properties.

I believe the correct approach is to use array.map(function (a) {}); but I cannot get the code right inside the function.

Thanks.

Nina Scholz · Accepted Answer · 2017-07-30 10:02:44Z

1

You could use a destruction of the object and a new object for the result array.

var object = { grants: [{ grant: 0, ID: "EP/E027261/1", Title: "Semiconductor Research at the Materials-Device Interface", PIID: "6674", Scheme: "Platform Grants", StartDate: "01/05/2007", EndDate: "31/10/2012", Value: "800579" }] },
    result = object.grants.map(({ EndDate, Value }) => ({ EndDate, Value }));

console.log(result);

ES5

var object = { grants: [{ grant: 0, ID: "EP/E027261/1", Title: "Semiconductor Research at the Materials-Device Interface", PIID: "6674", Scheme: "Platform Grants", StartDate: "01/05/2007", EndDate: "31/10/2012", Value: "800579" }] },
    result = object.grants.map(function (a) {
        return { EndDate: a.EndDate, Value: a.Value };
    });

console.log(result);

edited Jul 30, 2017 at 10:02

answered Jul 30, 2017 at 9:56

Nina Scholz

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