How to add item in objects nested inside arrays

Question

I am trying to add new items in both the field 'name' and 'breed' individually by using dogs_info.name.push(_) but getting an error:

Cannot read property 'name' of undefined

I am hoping for an in-depth solution.

var dogs_info = [
    {
        name : "rusty",
        breed : "corgi"
    },
    {
        name: "snoopy",
        breed: "pomperian"
    },
    {
        name: "ropper",
        breed: "husky"
    },
    {
        name: "maya",
        breed: "pomsky"
    },
    {
        name: "lara",
        breed: "alskan malamute"
    }
]

You're trying to access the property name of an array, which doesn't exist... You're also trying to push into a (random?) object which is not possible, since push is an array method. Not sure what your goal is. — Yannick K
– Yannick K, Commented Jul 7, 2019 at 12:20
I also wonder how you're getting the error you're getting. I would expect the error to be Cannot read property 'push' of undefined, since dogs_info is definitely defined. — Yannick K
– Yannick K, Commented Jul 7, 2019 at 12:27

T.J. Crowder · Accepted Answer · 2019-07-07 12:20:21Z

3

dogs_info has no property called name, so dogs_info.name gives you undefined.

dogs_info is an array of objects. The properties on those objects are not arrays.

It sounds like you may just want to add a new entry to the array, e.g.:

dogs_info.push({
    name: "fido",
    breed: "wee brun dug"
});

Note that there are no "nested arrays" in your example. You have a single array, which contains objects with name and breed properties (whose values are strings).

answered Jul 7, 2019 at 12:20

T.J. Crowder

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