Exclude undefined values from an array in React using JavaScript

I am working with an array of objects that contain content types

const contentTypes = [
    {
        "contentType": {
            "content_type_id": 2,
            "content_type": "image",
        },
    },
    {
        "contentType": {
            "content_type_id": 3,
            "content_type": "video",
        },
    },
    {
        "contentType": {
            "content_type_id": 1,
            "content_type": "audio",
        },
    },
]

In my function setType, I aim to match elements and set the content_type_id to content_type. The values are then converted to strings.

const setType = (selectedType) => {
    _setType(selectedType)
    const typeString = contentTypes.find((item) => {
        return item.contentType.content_type_id === selectedType
    }).contentType.content_type;
    onTypeChange(typeString)
}

The challenge arises when there is an element in the array contentTypes missing the content_type_id and content_type, resulting in the error:

Unhandled Runtime Error TypeError: Cannot read property 'contentType' of undefined

You can view the code on jsFiddle here => https://jsfiddle.net/9x426Lv7/2/

How can I handle this scenario in the find method? Are there alternative approaches to address this issue?

javascriptarraysfindundefined

Answer №1

Hello Koala7, here is a suggestion for you to try out:

function updateType(selectedType) {
    setType(selectedType);
    let type = contentTypes.find((item) => {
        return item.contentType.content_type_id === selectedType
    });
    let typeString = type ? type.contentType.content_type : null; // You can assign another default value instead of null
    onTypeChange(typeString);
}

Answer №2

It seems that your find function is failing to retrieve a value and instead returning undefined. Make sure to validate whether the selected type you are attempting to locate actually exists.

Answer №3

what do you think?

function setContentType(selectedType) {
    const type = contentTypes.find((item) => {
        return item.contentType.content_type_id === selectedType;
    });
    if(type) {
     return contentType.content_type;
    }
    return null;
}

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