Angular filter function encounters an issue if the value being filtered is null

Currently facing an issue while filtering an array. Whenever the filtered field is null, it triggers an error causing the rest of the code to fail. This is how my code looks like:

this.order= result.headerText.find((item) => item.textType === 'Order');

Everything works fine if texttype is 'Order', but if it's null, an error occurs and the subsequent code doesn't get executed.

https://i.sstatic.net/Z4Uhy.png

Seeking a way to check for the presence of textType with 'Order' and return it without crashing when it's null :)

https://i.sstatic.net/chvfY.png

javascriptangularjs

Answer №1

There may be a scenario where the 'item' within the headerText is null, but not the textType.

this.order = result.headerText && result.headerText.find((item) => item && item.textType === 'Order');

If utilizing the most recent release of TypeScript, you have the option to utilize the optional chaining proposal.

this.order = result.headerText?.find((item) => item?.textType === 'Order');

Answer №2

The find() function is specific to arrays. The issue you are encountering is likely due to result.headerText being null or not an array.

One way to handle this situation is to include a check like the following:

if (result.headerText && Array.isArray(result.headerText)) {
    return result.headerText.find(item => item.textType === 'Order')
}

return undefined;

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