How to remove a key in object in array

Question

I have an address that looks like this

let address = [{"_id":"6013a6ef20f06428741cf53c","address01":"123","address02":"512","postcode":"23","state":"512","country":"32","key":1},{"_id":"6013a6eh6012428741cf53c","address01":"512","address02":"6","postcode":"6612","state":"33","country":"512","key":2}]

How can I remove '_id' and 'key' together with its Key and Value Pair.

And can you please let me know how does this type of array is called? Is it called Object in Array? I keep seeing this type of array but I have no clue how to deal with this, is there like a cheatsheet to deal with?

Does this answer your question? Remove property for all objects in array — Nik
– Nik, Commented Jan 29, 2021 at 6:43
You can loop through the array with a forEach then use the delete operator to. delete the key/value pair you want — Kyle Lambert
– Kyle Lambert, Commented Jan 29, 2021 at 6:44

Matt · Accepted Answer · 2021-01-29 06:45:15Z

1

You can access the property of the object like this:

address[0]["_id"]
// or
address[0]._id

and you can delete the property like this:

delete address[0]["_id"]
// or
delete address[0]._id

Where 0 is the 1st index of the array. You might need to iterate over your array and remove the property from each object:

address.forEach(a => {
    delete a._id;
    delete a.key;
});

answered Jan 29, 2021 at 6:45

Matt

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3 Comments

Wing Shum Over a year ago

Hi, it is returning TypeError: address.forEach is not a function, Why is that?

Wing Shum Over a year ago

Hi Matt, thank you for your time, I've checked it, typeof address is string instead of object, it must be because I've JSON.stringify it before, however, if its currently string, how can I change it back to object?

Matt Over a year ago

You can't do much with a string. Use JSON.parse(address) to convert it back.

SandyKrish · Accepted Answer · 2021-01-29 06:52:22Z

1

First, this type of array is called "Array of Objects" (objects inside array)

Second, you can generate new set of array by delete the key which you want to remove by,

let newSetOfArray = address.map((obj)=> {
    delete obj._id;
    delete obj.key;
    return obj;
});

console.log(newSetOfArray);    // this array of objects has keys with absence of _id & key.

answered Jan 29, 2021 at 6:52

SandyKrish

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