Create a new property from an array with null value in an array of objects in javascript

Question

I have the below array of objects

const data=[{"id":1,"name":"Sam"},{"id":2,"name":"Peter"},{"id":3,"name":"Tom"}]

I have another array with property names

const property=["Address","Contact No."]

I want to create this property with value empty in the existing array so that the output will be as below

[{"id":1,"name":"Sam","Address":"","Contact No.":""},{"id":2,"name":"Peter","Address":"","Contact No.":""},{"id":3,"name":"Tom","Address":"","Contact No.":""}]

I tried the below code

for(var i=0;i<data.length;i++)
    {
        for(var j=0;j<property.length;j++)
        {
        data[i].property[j]=""
        }
    }

Am getting error as cannot set property '0' of undefined. Can someone let me know how to achieve this?

Or do: data.forEach(person => property.forEach(prop => person[prop] = "")); — user5734311
– user5734311, Commented Jul 8, 2021 at 5:33
Does this answer your question? Add a property to a JavaScript object using a variable as the name? — user5734311
– user5734311, Commented Jul 8, 2021 at 5:35
the link which you provided is different from the question posted — kameswari
– kameswari, Commented Jul 8, 2021 at 5:36
With .property you are checking for 'property' key in each object. Hence, the undefined. — Tushar Shahi
– Tushar Shahi, Commented Jul 8, 2021 at 5:45

Harrys Kavan · Accepted Answer · 2021-07-08 05:41:33Z

1

const data=[{"id":1,"name":"Sam"},{"id":2,"name":"Peter"},{"id":3,"name":"Tom"}]
const property=["Address","Contact No."]

property.forEach((prop)=> {
  data.forEach((d) => {
    d[prop] = ""
  })
})

console.log(data)

answered Jul 8, 2021 at 5:41

Harrys Kavan

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1 Comment

user5734311 Over a year ago

The question was marked as dupe 7 minutes already when you posted this. Please don't post answers to dupes unless the dupe isn't an actual dupe or really obsolete.

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